NOTE: This process will only update your locally stored save files, so you will need to refresh any existing cloud saves to reflect the new files. All characters and preferences in both the Steam and Epic versions of Borderlands 3 should show up the next time you boot them up.sav files representing your Vault Hunters.)
(These files include profile.sav which tracks your Options preferences and all the numbered. Your save data can be transferred between the Steam and Epic PC platforms, but the save files will have to be moved manually. Save files are located in your local 'Documents\My Games\Borderlands 3\Saved\SaveGames\' folder, with each Steam or Epic account having its own unique identification label (a long string of numbers and letters).