Terribly sorry but I didn't clock this area before posting on General help.
My issue is detailed here: https://moodle.org/mod/forum/discuss.php?d=405223
Some further details though, once I SSHed in I did clock that the user permissions were set up like this:
-rw-rw-r-- 1 daemon daemon
Not 100% sure that's relevant TBH, but it might help.