Here is a gallery with the ‘add your file’ option enabled — try it out. Include your name in the image filename, and set your sizing and quality to keep these under 1 Mb in size.
The cool thing is, members have to be logged to see the ‘add your file’ option because it’s restricted to at least a ‘subscriber’ role in the User Permissions section, and all paid club members are subscribers, at least. Visibility of the gallery is public, though.