Start an FTP server as user and transfer files directly via
most file browsers' builtin FTP support:
Windows File Explorer, Thunar, Gnome Files, Dolphin and many more!
Features:
User-friendly graphical interface.
No root nor special permissions required.
Supports FTP, FTPS and SFTP.
Single-user authentication.
Optional read-only filesystem.
Known upstream bugs (full list at documentation page):
Gtk4 - Unresponsive UI after touch input. Gtk#5096
Gtk4 - Dropdown menus not working under Steam Deck Gamescope.
Libadwaita - No theme support (GTK_THEME). libadwaita#677
Flatpak - Directory selection not working under Steam Deck Gamescope.