Welcome the Technical Support section. Help us in assisting you by providing us with a concise and descriptive elaboration of your issues. Be specific and if possible, provide us with a step-by-step instruction in replicating your problem.
could you please try it again? I cant reproduce this issue.
if the issue still exist, please elaborate more:
what URL for that album?
what logged in user?
please give me time to tackle this issue. do not mark this issue as resolved or escalated. it will disappear at my task list, and it will make more delay :)
the issue related with folder group/owner setting at your server. you need to set the group/owner to www-data instead of 517/515
the error said, the photo file was failed to write at new created folder. because the folder group/owner restriction.
my sugestion, please asking your server support about it. because to changing the folder group/owner always depending with server enviroment and configurations.