I hold command and click and drag up to select multiple cursors for the number of items that I copied. You have to do something similar for the items you copy.

You're correct that indexing a low cardinality column like the Role may not be beneficial. 

While it may be annoying with Active Storage, it's probably best to let it handle the folder/file structure within S3. This isn't something that one should be touching in ideal worlds.

If you're on a Rails 7 Application, I would probably not create custom channels if you can avoid it. Hotwire's Turbo has gotten us so far to where a lot of the manual channels are no longer needed and can exist in the background now through Turbo.

Did you deviate from the Dockerfile? Make sure that libpq-dev is being installed in the Dockerfile.