Submitted post is saved as draft
Each site has it's own requirement. Some sites want the posted article/image/video to get it displayed as soon as posted and some want author/admin to review it before it is visible to public.
Post are set as draft because the post is marked as review before it is published. You can change it from Admin Dashboard > User Photo Gallery > UPG Settings >User-Post Gallery Tab
Enable the check mark at the title
[Automatically publish UPG Post as soon as user upload/submit]
After it is enabled post are displayed as soon as posted. No moderation required.