Export a video image (aka "screenshot") should be accessible from menu

Description

I've seen that video image export (screenshot) have been implemented by !1456 (merged). BUT this is quite an "hidden" feature (3 fingers tap is not common); I think this could be great to access it from the menu also (the menu that opens when clicking the hamburger menu at the right of the bottombar).

Expected behavior

While playing a video, when the user clicks on "export an image", the current displayed image is saved (in default Android images folder I guess). Easier to pause the video first.

App mode

Smartphone