Feature Request: Save to Picture Gallery

[jtrees]

Please add the ability to save a received picture to the Android gallery.

When receiving images in an encrypted room there is currently no way (that I know of) to get that image (decrypted) into the Android gallery. This severely limits the usefulness of Riot as a mobile instant messenger for me.

[bmarty]

Duplicate of #677

[jtrees]

These issues sound like different things. Also note how this issue has six thumbs-up and the other one has none.

[bmarty]

Yes, my bad, it's actually related to #677

[bmarty]

So we can:

• add a share menu item on the media viewer, using the same share icon.
• add an entry "Save..." to the message bottom sheet for all events with attachment (image/file/etc.)

It should work for both clear and e2e image.