I use it for sync’ing:
-Save file for non-Steam games, between my PC and Steamdeck.
-Sideloaded mods (Rimworld, Darkest Dungeon and emulated Nintendo Switch games), between my PC and Steamdeck.
-Anytime I want to quickly send/receive some files between my PC and Steamdeck.
-Lust provoking images from my phone to PC.
One of the best software I’ve ever installed. I don’t have to copy files from my phone to PC anymore, just let it automatically be synced.