Reels profile grid thumbnail.

[phillypro]

we could really benefit from this feature....right now there is no way to crop the cover....
if a reel shows up in the feed it will typically be mispositioned

[subzeroid]

Maintainer note: for existing Reels, use the current cover helpers where Instagram allows it, such as clip_change_cover(...). Profile-grid thumbnail behavior is account/app-surface dependent and may still need a current app capture for unsupported cases.