Follow lists not importing?

This is the only thing I imported when I joined and it worked.

You've probably joined on the new beta key wave which means everyone else is also doing this, so the import might take a good while to finally finish. It took it's time for me aswell eventhough I didn't join on a wave. You can expect to wait a couple of hours, if not even more.

Actually, it took me forever to even be able to import anything. Mobile browsers are kinda crap for reloading pages after leaving for awhile...which might've led to that.

But the thing is, my avatar and artwork made it through, but not my follow lists. It keeps saying it's done grabbing those even after restarting and letting it finish, but still no difference. Do those imports take longer, but in the background?

You could test by watching a new person on FA (who also has FN and used the import) and try if it adds that.

Remember that in order to import watches and follows, all those other people need to have used the import too (otherwise it wont match them, even if they had same usernames). Theres a few artists here who I watch on FA but weren't imported on my watch list, but they'll be added when they use the import follows&followers.