A Steam Deck may be a handheld PC, but it's not necessarily obvious how to move files back and forth. You've got a few options.

If you want to move Steam, Epic, Origin, or Uplay games from one PC to another computer successfully, follow the instructions in this post.

A new Steam Deck feature could allow for game and file sharing between your PC Steam client and the handheld device, as code strings in the latest Steam update apparently point to Valve finally ...

Will Valve soon add a feature to allow file sharing from Steam? This could be big news for Steam Deck owners.