I found the easiest way to transfer files to and from my Linux PC - and it's so fast

ZDNET's key takeaways QuickDAV is a user-friendly app to share files and folders.QuickDAV allows you to upload, download, and manage files remotely.QuickDAV is free to install and use on any Linux ...
Android Authority

How to connect your Steam Deck to a PC and transfer files

Perhaps the most ideal method for file transfer is through an app called KDE Connect. KDE created the underlying software for the Steam Deck’s Desktop mode, so not too surprisingly, it should work ...