Cloud accounts · Other bucket storage (S3-compatible)
What does "Bucket not set — transfers will fail" mean?
Short answer: The bucket storage account has no bucket saved, so every transfer would fail with "bucket does not exist". Click Edit bucket… on the banner, enter the bucket's exact name, save, and test the connection.
It means this bucket storage account has no bucket saved — usually because it was added by an older version or saved without one — so transfers to it would fail with a "bucket does not exist" error every time.
Click Edit bucket… on the banner (or Edit), type the bucket's exact name, and save. Then run Test connection. Any transfers or backups that failed for this reason can simply be run again.