Yeah, for external images I’m not doing anything, but in the case of avatars I’ll save them as Discourse uploads. I’ll double check what other options I have.
Also, I need to fix references to posts inside posts, so these are not broken after the migration.
I personally can live without avatar migration. I think of all the things that is simple enough to tell users to re-upload manually, especially since I think the imgur plugin forced all of those to get uploaded there instead of locally. That is likely an edge case for NodeBB users.