When you upload media in your (in this case Primal) client, you should setup the mirroring of your media, so it is automatically uploaded to one more media host (blossom.band) in this case. If/when your primary media host is unavailable, capable client will automatically fetch it from the backup and people will still be able to see it.
@Fabian I think I found the issue. It seems that Nostur expects full nip96 like response in blossom nip94 tags, while BUD08 just states tags array of arrays under nip94 field, nothing else. Initially I got it wrong too, and returned it as your check does. Now it is fixed and complies with BUD08 specs.