diff --git a/apps/readest-app/src/__tests__/services/app-service.test.ts b/apps/readest-app/src/__tests__/services/app-service.test.ts
index ae8c799d..3ee139f9 100644
--- a/apps/readest-app/src/__tests__/services/app-service.test.ts
+++ b/apps/readest-app/src/__tests__/services/app-service.test.ts
@@ -269,6 +269,22 @@ describe('BaseAppService', () => {
       const result = await service.resolveFilePath('', 'Data');
       expect(result).toBe('/base/books');
     });
+
+    // base 'None' carries a complete, absolute source path (in-place /
+    // external books point `book.filePath` outside Books/<hash>/). Its prefix
+    // is empty, so the path must be returned verbatim. Prepending a separator
+    // produced `/C:\Users\...` on Windows (and `//Users/...` on POSIX), which
+    // the native upload guard (transfer_file.rs `ensure_path_allowed`) rejects
+    // as "path not in filesystem scope" — issue #4720.
+    test('returns an absolute path unchanged when the prefix is empty (base None)', async () => {
+      vi.mocked(mockFs.getPrefix).mockResolvedValue('');
+
+      const windowsPath = "C:\\Users\\me\\Documents\\books\\Alice's Adventures.epub";
+      expect(await service.resolveFilePath(windowsPath, 'None')).toBe(windowsPath);
+
+      const posixPath = '/Users/me/Documents/books/Alice.epub';
+      expect(await service.resolveFilePath(posixPath, 'None')).toBe(posixPath);
+    });
   });
 
   describe('settings', () => {
diff --git a/apps/readest-app/src/app/library/components/ImportFromFolderDialog.tsx b/apps/readest-app/src/app/library/components/ImportFromFolderDialog.tsx
index 4a8c79fb..e1f831c3 100644
--- a/apps/readest-app/src/app/library/components/ImportFromFolderDialog.tsx
+++ b/apps/readest-app/src/app/library/components/ImportFromFolderDialog.tsx
@@ -434,7 +434,7 @@ const ImportFromFolderDialog: React.FC<ImportFromFolderDialogProps> = ({
           </button>
           <button
             type='button'
-            className={clsx('btn btn-primary btn-sm', confirmDisabled && 'btn-disabled')}
+            className={clsx('btn btn-contrast btn-sm', confirmDisabled && 'btn-disabled')}
             disabled={confirmDisabled}
             onClick={handleConfirm}
           >
diff --git a/apps/readest-app/src/services/appService.ts b/apps/readest-app/src/services/appService.ts
index 864d1453..2834ff76 100644
--- a/apps/readest-app/src/services/appService.ts
+++ b/apps/readest-app/src/services/appService.ts
@@ -164,7 +164,13 @@ export abstract class BaseAppService implements AppService {
 
   async resolveFilePath(path: string, base: BaseDir): Promise<string> {
     const prefix = await this.fs.getPrefix(base);
-    return path ? `${prefix}/${path}` : prefix;
+    if (!path) return prefix;
+    // `base: 'None'` carries an already-absolute source path (in-place /
+    // external books point `book.filePath` outside Books/<hash>/) and its
+    // prefix is empty. Joining unconditionally turned `C:\Users\…` into
+    // `/C:\Users\…` (and `/Users/…` into `//Users/…`), which the native
+    // upload guard rejects as outside the fs scope — issue #4720.
+    return prefix ? `${prefix}/${path}` : path;
   }
 
   async readDirectory(path: string, base: BaseDir): Promise<FileItem[]> {