can not upload folders by click the upload btn

**Problem** the file index.html `<div class="control upload-file hidden" title="Upload files/folders">` in fact, can not upload folders by click the upload btn. **Configuration** <!-- Please specify the Dufs command-line arguments or configuration used. --> <!-- If the issue is related to authentication/permissions, include auth configurations while concealing sensitive information (e.g., passwords). --> **Log** <!-- Attach relevant log outputs that can help diagnose the issue. --> **Screenshots/Media** <!-- If applicable, add screenshots or videos that help illustrate the issue, especially for WebUI problems. --> **Environment Information** - Dufs version: - Browser/Webdav info: - OS info: - Proxy server (if any): <!-- e.g. nginx, cloudflare -->