Also, though rarer nowadays, some older games had bonuses if you had the game saves, the sole save format back then, of others (usually previous) games from the franchise. Naruto Ultimate Ninja 5 and Dragon Ball Budokai Tenkaichi 2, for example and if memory doesn’t fail me, gave you money if they detected saves from, respectively, Ultimate Ninja 4 and Budokai Tenkaichi, while Persona 3 FES allows you to carry over the compendium of Persona 3 saves and Final Fantasy X can bring over from other saves of the same game items needed to understand the language of a group in the story.
Regarding wonky links, I can’t say I’m familiar with the issue. You could try checking Mint’s desktop files to see how the commands are set up, and if they work fine manually through the terminal. If they don’t, that’s probably an indication of where the issue is.
Regarding videos, those are… problematic, some times even on Windows (FF Type-0 and Mary Skelter PTSD intensifies). Perhaps you’re missing a drive, or Proton’s equivalent of winecfg may need some manual tinkering.
And regarding auto-mounting drives, are they being automatically mounted to a static path, and before Steam is loaded? Also maybe deactivating Steam’s auto-start, if it’s active, helps?