Cannot restore backup from cli

Followed this guide and moved it and got this error:

root@ftsweb-app:/var/www/discourse# discourse restore blackiron-2022-12-03-163112-v20221201035918.tar.gz
Starting restore: blackiron-2022-12-03-163112-v20221201035918.tar.gz
[STARTED]
'system' has started the restore!
Marking restore as running...
Making sure /var/www/discourse/tmp/restores/default/2023-11-28-060452 exists...
Copying archive to tmp directory...
EXCEPTION: /var/www/discourse/lib/discourse.rb:138:in `exec': Failed to copy archive to tmp directory.
cp: cannot open '/var/www/discourse/public/backups/default/blackiron-2022-12-03-163112-v20221201035918.tar.gz' for reading: Permission denied