The description of FTP Server via Wi-Fi - BrowseFTP
Turn your Android device into an FTP server and start sharing your files over the wireless network (Wi-Fi).
You can safely share files with a nearby computer or any device connected to the same network. This app will allow you to browse your phone or tablet internal or external (SD card) storage wirelessly to backup and share your photos, videos, documents, and any other content.
You will also find it useful when having USB port sync issues that prevent you from mounting your device on Windows, Linux or macOS (Apple).
You can also access your phone or tablet content from any FTP client (FileZilla, for instance) or browse directly using your OS Internet browser (Firefox, Chrome, Opera, etc.).
Key Features: - Configurable Username/ Password/Port Number - Supports FTP & FTPS Protocols - Anonymous Access Support - Mount Internal/External Directories - Share over Wi-Fi or Tethering and Portable Hotspot - Widget for Starting/Stopping FTP Server - AutoStart