Make the "Save" button on Android more obvious

Whenever I’m teaching people how to use the iNaturalist Android app, I see them add the photo(s) and species ID, then waffle when trying to figure out how to save the observation.

On Android, the save button is a tiny little grey checkmark in the top right corner of the observation. On iOS, it’s a big green button and at the bottom of the screen, easily accessible to normal human-sized hands on 2019-sized mobile devices.

Can the save button be made much more obvious and easily accessible for Android?

(See related request to add a “Save and add another observation” button)

Added issue: