ALSO - there needs to be a mechanism to either mark models on Sketchfab as “migrated” or to remove them from Sketchfab once they migrate to FAB. Otherwise, you find yourself in a position where there are 30 models that need to be “fixed” to migrate to FAB but you can’t tell which has been migrated and which have not - so lots of time is wasted just trying to figure that part out.
The system is really not well thought out.