# UnifiedFiler v1.4 Notes

v1.4 focuses on browser-local file handling and transfer progress while keeping UnifiedFiler as an embeddable AMD package for Host systems.

## Implemented

- `LocalDiskAdapter` now supports browser File System Access API directory mounting.
- Mounted local folders can be listed, searched, read, written, deleted, and extended with new folders.
- Native open/save picker methods are available through adapter and FileService APIs.
- Download and file-input fallback behavior remains available for unsupported browsers.
- Large Blob writes use chunked writing with progress callback support.
- `OperationProgressService` provides reusable progress events for Explorer, dialogs, Host integrations, and future API transfer adapters.
- FileExplorer has a local-folder mount toolbar/context command, mount hint panel, mounted event, and progress status bar.
- Demo bootstrap includes the progress service and demonstrates Host-side dependency assembly.

## Browser notes

The File System Access API requires a supported secure context such as localhost or HTTPS and must be triggered by a user gesture. Browsers without this API still use file input and download fallback flows.