Had to manually import save

The saves won't import automatically, so you need to do it yourself. There is a great Reddit post on this, but I'll copy-paste the results here (shoutout to Wolfpackalpha for writing this).

Go into Desktop mode

Go to file explorer

Enable to see "hidden folders", by going to the top right hamburger menu

Go to Home -> .local-> share -> Steam -> steamapps -> compdata

Pick the game you want (Google "Steam ID for _________"). Banner Saga 1 is 237990 Banner saga 2 is 281640

From there, pfx-> drive_c -> users -> steamuser -> appdata -> roaming -> The Banner Saga ->Localstore and then your save file is in the "Save" folder.

I copied the entire local store folder from Banner saga 1, renamed it to say it was Banner saga one's, and pasted it into "The Banner Saga 2"'s folder (Follow steps 4-6 but use Banner Saga 2 data)

From here, go into Banner Saga 2, start a new game, import game. It'll bring up an old looking file explorer. For me, it defaults to showing Adobe, Microsoft, TheBannerSaga2. Click on Banner Saga 2, and you should see the folder you pasted in earlier. Click it, then:

save->saga1->0->sav_finale_save.json and click open