I agree with @andreyka here, that it's a bit sloppy to not define #Pixelfedapp as a share source @dansup . Though you DO offer access to all folders (thankfully 😁)

Also: pinch to zoom only zooms within the already small frame, instead of the #Instagram way of doing this, where the entire image gets overlaid over the app Window, enabling blowing up to fullscreen.
The way you've implemented it now is like looking through a keyhole ... 🙄