Well the name is confusing to begin with. Calling jt "Gallery" makes it seem like you can upload pictures to it.

All the other social medias also use the Gallery profile tab show all the pictures your profile has uploaded. Should be called favorite media or something related.

Where it says "Feed is Empty" you could also explain to users how to add favorite media to the gallery.

And the Add to Gallery is hidden. It's hidden in the "share" button.

Maybe there should be a button in between the share and download button called "Add" or a plus symbol. (+)