anyway to share clips/screenshots of non window's store games on xbox app?

hello does anyone have any ideas/possibilities on how to share clips & screenshots from non windows store games to xbox app on windows 10? I want to share my clips like from csgo, skyrim, etc to the activity feed on xbox app but your only allowed to share windows store games only

I've been trying to distinguish what is different from windows store games to my own clips, to see what could be causing the block of not allowing to share. I also tried renaming my clip to exactly "Shark Dash! By Gameloft" still wouldn't let me share the clip.

I feel its checking somewhere deeper to be able to tell what game the clip is for. maybe need to use a hex editor?