diff --git a/App.jsx b/App.jsx
index 9049fb4..31a0555 100644
--- a/App.jsx
+++ b/App.jsx
@@ -2087,7 +2087,7 @@ function MainApp({ username, onLogout }) {
   const [regionFilter, setRegionFilter] = useState('all');
   const [attachmentNote, setAttachmentNote] = useState('');
   const [attachmentCategory, setAttachmentCategory] = useState(FILE_CATEGORIES[0]);
-  const [attachmentFile, setAttachmentFile] = useState(null);
+  const [attachmentFiles, setAttachmentFiles] = useState([]);
   const [uploading, setUploading] = useState(false);
   const [fileInputKey, setFileInputKey] = useState(0);
   const [fileDragActive, setFileDragActive] = useState(false);
@@ -2138,7 +2138,7 @@ function MainApp({ username, onLogout }) {
   const [supplierDraft, setSupplierDraft] = useState(null);
   const [supplierSearch, setSupplierSearch] = useState('');
   const [supplierAttachmentNote, setSupplierAttachmentNote] = useState('');
-  const [supplierAttachmentFile, setSupplierAttachmentFile] = useState(null);
+  const [supplierAttachmentFiles, setSupplierAttachmentFiles] = useState([]);
   const [supplierUploading, setSupplierUploading] = useState(false);
   const [supplierFileInputKey, setSupplierFileInputKey] = useState(0);
   const [supplierFileDragActive, setSupplierFileDragActive] = useState(false);
@@ -2471,33 +2471,36 @@ function MainApp({ username, onLogout }) {
   function handleFileDrop(e) {
     e.preventDefault();
     setFileDragActive(false);
-    const f = e.dataTransfer.files && e.dataTransfer.files[0];
-    if (f) setAttachmentFile(f);
+    const files = e.dataTransfer.files && Array.from(e.dataTransfer.files);
+    if (files && files.length) setAttachmentFiles(files);
   }
   async function handleUploadAttachment(customerId, folderId) {
-    if (!attachmentFile) { notify('请先选择文件'); return; }
+    if (!attachmentFiles.length) { notify('请先选择文件'); return; }
     setUploading(true);
+    const failed = [];
     try {
-      const res = await uploadFile(customerId, attachmentFile);
-      setCustomers(prev => prev.map(c => {
-        if (c.id !== customerId) return c;
-        const entry = {
-          fileName: res.fileName,
-          originalName: res.originalName,
-          category: attachmentCategory,
-          note: attachmentNote.trim(),
-          date: todayStr(),
-          folderId: folderId || null,
-        };
-        return { ...c, attachments: [entry, ...(c.attachments || [])] };
-      }));
-      setAttachmentFile(null);
+      for (const file of attachmentFiles) {
+        try {
+          const res = await uploadFile(customerId, file);
+          const entry = {
+            fileName: res.fileName,
+            originalName: res.originalName,
+            category: attachmentCategory,
+            note: attachmentNote.trim(),
+            date: todayStr(),
+            folderId: folderId || null,
+          };
+          setCustomers(prev => prev.map(c => (c.id === customerId ? { ...c, attachments: [entry, ...(c.attachments || [])] } : c)));
+        } catch (e) {
+          failed.push(`${file.name}：${e.message}`);
+        }
+      }
+      setAttachmentFiles([]);
       setAttachmentNote('');
       setAttachmentCategory(FILE_CATEGORIES[0]);
       setFileInputKey(k => k + 1);
-      notify('已上传');
-    } catch (e) {
-      notify('上传失败，请重试');
+      if (failed.length === 0) notify('已上传');
+      else notify(`${attachmentFiles.length - failed.length}个成功，失败：${failed.join('；')}`);
     } finally {
       setUploading(false);
     }
@@ -2617,25 +2620,28 @@ function MainApp({ username, onLogout }) {
   function handleSupplierFileDrop(e) {
     e.preventDefault();
     setSupplierFileDragActive(false);
-    const f = e.dataTransfer.files && e.dataTransfer.files[0];
-    if (f) setSupplierAttachmentFile(f);
+    const files = e.dataTransfer.files && Array.from(e.dataTransfer.files);
+    if (files && files.length) setSupplierAttachmentFiles(files);
   }
   async function handleUploadSupplierAttachment(supplierId) {
-    if (!supplierAttachmentFile) { notify('请先选择文件'); return; }
+    if (!supplierAttachmentFiles.length) { notify('请先选择文件'); return; }
     setSupplierUploading(true);
+    const failed = [];
     try {
-      const res = await uploadFile(supplierId, supplierAttachmentFile);
-      setSuppliers(prev => prev.map(s => {
-        if (s.id !== supplierId) return s;
-        const entry = { fileName: res.fileName, originalName: res.originalName, note: supplierAttachmentNote.trim(), date: todayStr() };
-        return { ...s, attachments: [entry, ...(s.attachments || [])] };
-      }));
-      setSupplierAttachmentFile(null);
+      for (const file of supplierAttachmentFiles) {
+        try {
+          const res = await uploadFile(supplierId, file);
+          const entry = { fileName: res.fileName, originalName: res.originalName, note: supplierAttachmentNote.trim(), date: todayStr() };
+          setSuppliers(prev => prev.map(s => (s.id === supplierId ? { ...s, attachments: [entry, ...(s.attachments || [])] } : s)));
+        } catch (e) {
+          failed.push(`${file.name}：${e.message}`);
+        }
+      }
+      setSupplierAttachmentFiles([]);
       setSupplierAttachmentNote('');
       setSupplierFileInputKey(k => k + 1);
-      notify('已上传');
-    } catch (e) {
-      notify('上传失败，请重试');
+      if (failed.length === 0) notify('已上传');
+      else notify(`${supplierAttachmentFiles.length - failed.length}个成功，失败：${failed.join('；')}`);
     } finally {
       setSupplierUploading(false);
     }
@@ -3344,8 +3350,8 @@ function MainApp({ username, onLogout }) {
                       setAttachmentNote={setAttachmentNote}
                       attachmentCategory={attachmentCategory}
                       setAttachmentCategory={setAttachmentCategory}
-                      attachmentFileName={attachmentFile ? attachmentFile.name : ''}
-                      onPickAttachment={(f) => setAttachmentFile(f)}
+                      attachmentFileNames={attachmentFiles.map(f => f.name)}
+                      onPickAttachment={(files) => setAttachmentFiles(files)}
                       uploading={uploading}
                       fileInputKey={fileInputKey}
                       onUploadAttachment={(folderId) => handleUploadAttachment(selected.id, folderId)}
@@ -3707,8 +3713,8 @@ function MainApp({ username, onLogout }) {
                       onDelete={() => deleteSupplier(selectedSupplier.id)}
                       attachmentNote={supplierAttachmentNote}
                       setAttachmentNote={setSupplierAttachmentNote}
-                      attachmentFileName={supplierAttachmentFile ? supplierAttachmentFile.name : ''}
-                      onPickAttachment={(f) => setSupplierAttachmentFile(f)}
+                      attachmentFileNames={supplierAttachmentFiles.map(f => f.name)}
+                      onPickAttachment={(files) => setSupplierAttachmentFiles(files)}
                       uploading={supplierUploading}
                       fileInputKey={supplierFileInputKey}
                       onUploadAttachment={() => handleUploadSupplierAttachment(selectedSupplier.id)}
@@ -4171,10 +4177,11 @@ function SupplierForm({ draft, setDraft, onSave, onCancel }) {
 
 function SupplierDetail({
   supplier: s, onEdit, onDelete,
-  attachmentNote, setAttachmentNote, attachmentFileName, onPickAttachment, uploading, fileInputKey,
+  attachmentNote, setAttachmentNote, attachmentFileNames, onPickAttachment, uploading, fileInputKey,
   onUploadAttachment, onDeleteAttachment, fileDragActive, onFileDragOver, onFileDragLeave, onFileDrop,
 }) {
   const attachments = s.attachments || [];
+  const [previewFile, setPreviewFile] = useState(null); // { url, name }
   return (
     <div className="panel">
       <div className="panel-header">
@@ -4197,19 +4204,19 @@ function SupplierDetail({
         {s.notes && <div className="field"><span className="field-label">备注</span><div style={{ fontSize: 12.5, whiteSpace: 'pre-wrap' }}>{s.notes}</div></div>}
 
         <div className="field">
-          <span className="field-label">厂家资料（PDF / 图片等）</span>
+          <span className="field-label">厂家资料（PDF / 图片等，支持多选）</span>
           <div style={{ display: 'flex', gap: 8, alignItems: 'stretch', flexWrap: 'wrap', marginBottom: 8 }}>
             <label
               className={`dropzone ${fileDragActive ? 'drag-active' : ''}`}
               onDragOver={onFileDragOver} onDragLeave={onFileDragLeave} onDrop={onFileDrop}
             >
               <input
-                key={fileInputKey} type="file"
-                onChange={e => onPickAttachment(e.target.files && e.target.files[0])}
+                key={fileInputKey} type="file" multiple
+                onChange={e => onPickAttachment(e.target.files ? Array.from(e.target.files) : [])}
                 style={{ display: 'none' }}
               />
               <Paperclip size={15} style={{ marginBottom: 4 }} />
-              <div>{fileDragActive ? '松开鼠标完成选择' : attachmentFileName ? `已选择：${attachmentFileName}` : '点击选择文件，或把文件拖到这里'}</div>
+              <div>{fileDragActive ? '松开鼠标完成选择' : attachmentFileNames.length ? `已选择 ${attachmentFileNames.length} 个文件：${attachmentFileNames.join('、')}` : '点击选择文件（可多选），或把文件拖到这里'}</div>
             </label>
             <div style={{ display: 'flex', flexDirection: 'column', gap: 8, flex: '1 1 160px' }}>
               <input
@@ -4231,15 +4238,20 @@ function SupplierDetail({
               <div style={{ flex: 1, minWidth: 0 }}>
                 <span className="crm-mono" style={{ fontSize: 11.5, color: 'var(--ink-soft)' }}>{a.date}</span>
                 <div style={{ fontSize: 12.5, wordBreak: 'break-word', marginTop: 2 }}>
-                  <a href={`/uploads/${s.id}/${a.fileName}`} target="_blank" rel="noreferrer" download={a.originalName} style={{ color: 'var(--blue)' }}>{a.originalName}</a>
+                  <span
+                    onClick={() => setPreviewFile({ url: `/uploads/${s.id}/${a.fileName}`, name: a.originalName })}
+                    style={{ color: 'var(--blue)', cursor: 'pointer' }}
+                  >{a.originalName}</span>
                   {a.note && <span style={{ color: 'var(--ink-soft)' }}> — {a.note}</span>}
                 </div>
               </div>
+              <a className="btn btn-sm btn-ghost" href={`/uploads/${s.id}/${a.fileName}`} download={a.originalName} title="下载"><Download size={12} /></a>
               <button className="btn btn-sm btn-ghost btn-danger" onClick={() => onDeleteAttachment(a.fileName)}><Trash2 size={12} /></button>
             </div>
           ))}
         </CollapsibleSection>
       </div>
+      {previewFile && <FilePreviewModal url={previewFile.url} name={previewFile.name} onClose={() => setPreviewFile(null)} />}
     </div>
   );
 }
@@ -4350,6 +4362,40 @@ function ContactInfo({ icon, label, value, active, onToggle }) {
   );
 }
 
+function isPreviewableImage(name) { return /\.(jpe?g|png|gif|webp|svg|bmp)$/i.test(name || ''); }
+function isPreviewablePdf(name) { return /\.pdf$/i.test(name || ''); }
+
+function FilePreviewModal({ url, name, onClose }) {
+  const isImage = isPreviewableImage(name);
+  const isPdf = isPreviewablePdf(name);
+  const wide = isImage || isPdf;
+  return (
+    <div className="modal-overlay" onClick={onClose}>
+      <div className="modal-box" style={{ maxWidth: wide ? 820 : 420, width: wide ? '90vw' : undefined }} onClick={e => e.stopPropagation()}>
+        <div className="modal-head">
+          <div className="panel-title" style={{ wordBreak: 'break-word', fontSize: 13.5 }}>{name}</div>
+          <div style={{ display: 'flex', gap: 8, flexShrink: 0 }}>
+            <a className="btn btn-sm" href={url} download={name} title="下载"><Download size={13} /></a>
+            <button className="btn btn-ghost btn-sm" onClick={onClose}><X size={14} /></button>
+          </div>
+        </div>
+        <div className="modal-body" style={{ padding: wide ? 0 : 18 }}>
+          {isImage ? (
+            <img src={url} alt={name} style={{ width: '100%', maxHeight: '78vh', objectFit: 'contain', display: 'block', background: 'var(--bg)' }} />
+          ) : isPdf ? (
+            <iframe src={url} title={name} style={{ width: '100%', height: '78vh', border: 'none', display: 'block' }} />
+          ) : (
+            <div style={{ textAlign: 'center', padding: '20px 10px' }}>
+              <FileText size={32} color="var(--ink-soft)" style={{ marginBottom: 10 }} />
+              <div style={{ fontSize: 13, color: 'var(--ink-soft)' }}>这个文件类型不支持在线预览，点右上角下载按钮打开</div>
+            </div>
+          )}
+        </div>
+      </div>
+    </div>
+  );
+}
+
 function CollapsibleSection({ title, count, defaultOpen, children }) {
   const [open, setOpen] = useState(!!defaultOpen);
   return (
@@ -4383,7 +4429,7 @@ function CustomerDetail({
   customer: c, now, onEdit, onDelete,
   onTogglePreferred, onToggleVip, onToggleOrdered,
   attachmentNote, setAttachmentNote, attachmentCategory, setAttachmentCategory,
-  attachmentFileName, onPickAttachment, uploading, fileInputKey, onUploadAttachment, onDeleteAttachment, onMoveAttachment,
+  attachmentFileNames, onPickAttachment, uploading, fileInputKey, onUploadAttachment, onDeleteAttachment, onMoveAttachment,
   onCreateFolder, onRenameFolder, onDeleteFolder,
   fileDragActive, onFileDragOver, onFileDragLeave, onFileDrop,
 }) {
@@ -4392,6 +4438,7 @@ function CustomerDetail({
   const [fileSearch, setFileSearch] = useState('');
   const [fileCategoryFilter, setFileCategoryFilter] = useState('all');
   const [currentFolderId, setCurrentFolderId] = useState(null);
+  const [previewFile, setPreviewFile] = useState(null); // { url, name }
 
   const folders = c.fileFolders || [];
   const attachments = c.attachments || [];
@@ -4519,12 +4566,12 @@ function CustomerDetail({
               onDragOver={onFileDragOver} onDragLeave={onFileDragLeave} onDrop={onFileDrop}
             >
               <input
-                key={fileInputKey} type="file"
-                onChange={e => onPickAttachment(e.target.files && e.target.files[0])}
+                key={fileInputKey} type="file" multiple
+                onChange={e => onPickAttachment(e.target.files ? Array.from(e.target.files) : [])}
                 style={{ display: 'none' }}
               />
               <Paperclip size={15} style={{ marginBottom: 4 }} />
-              <div>{fileDragActive ? '松开鼠标完成选择' : attachmentFileName ? `已选择：${attachmentFileName}` : '点击选择文件，或把文件拖到这里'}</div>
+              <div>{fileDragActive ? '松开鼠标完成选择' : attachmentFileNames.length ? `已选择 ${attachmentFileNames.length} 个文件：${attachmentFileNames.join('、')}` : '点击选择文件（可多选），或把文件拖到这里'}</div>
             </label>
             <div style={{ display: 'flex', flexDirection: 'column', gap: 8, flex: '1 1 160px' }}>
               <select className="select" value={attachmentCategory} onChange={e => setAttachmentCategory(e.target.value)}>
@@ -4564,7 +4611,10 @@ function CustomerDetail({
                     <span className="crm-mono" style={{ fontSize: 11.5, color: 'var(--ink-soft)' }}>{a.date}</span>
                     {' '}<span className="badge badge-region">{a.category || 'Other'}</span>
                     <div style={{ fontSize: 12.5, wordBreak: 'break-word', marginTop: 2 }}>
-                      <a href={`/uploads/${c.id}/${a.fileName}`} target="_blank" rel="noreferrer" style={{ color: 'var(--blue)' }}>{a.originalName}</a>
+                      <span
+                        onClick={() => setPreviewFile({ url: `/uploads/${c.id}/${a.fileName}`, name: a.originalName })}
+                        style={{ color: 'var(--blue)', cursor: 'pointer' }}
+                      >{a.originalName}</span>
                       {a.note && <span style={{ color: 'var(--ink-soft)' }}> — {a.note}</span>}
                     </div>
                   </div>
@@ -4577,6 +4627,7 @@ function CustomerDetail({
                     <option value="">根目录</option>
                     {folders.map(f => <option key={f.id} value={f.id}>{folderPathLabel(folders, f.id)}</option>)}
                   </select>
+                  <a className="btn btn-sm btn-ghost" href={`/uploads/${c.id}/${a.fileName}`} download={a.originalName} title="下载"><Download size={12} /></a>
                   <button className="btn btn-sm btn-ghost btn-danger" onClick={() => onDeleteAttachment(a.fileName)}><Trash2 size={12} /></button>
                 </div>
               ))}
@@ -4584,6 +4635,7 @@ function CustomerDetail({
           )}
         </CollapsibleSection>
       </div>
+      {previewFile && <FilePreviewModal url={previewFile.url} name={previewFile.name} onClose={() => setPreviewFile(null)} />}
     </div>
   );
 }