Last week I tried to fully move to Masto and Bsky Sources, but man Mastodons Webp Just do not work when sceduelling posts, so going forward I'll just do bsky sources.
Sauce: https://bsky.app/profile/kanayukino.bsky.social/post/3l7fglp3huj2q
Oh! Yeah I should also add bluesky entries to my artist database. I already have a system for finding and including a link in posts when artists have a fediverse account, but not for bluesky.
Also couldn't you just re-host the image?
I upload to catbox when scheduling my posts, but of course the then already uploaded image doesn't get used until much later.
You can even do that with lemmy, you can upload an image, grab the link to the file it creates, then post it later.