FlatPaks don't use applied theme even when giving them access

Hey All!
I just installed a theme and applied it but my flatpak apps do not seem to change. I understand that is sort of how they function (being containerized). I followed a guide to have all flatpaks see the theme folder and change the ‘GTK_THEME=’ to my theme but as soon as I do that, all of my flatpak apps turn white (instead of the default dark). Am I doing something wrong? I suspect that FlatSeal cant seem to recognize the theme location? Is it because I installed my theme to ‘~/.local/share/themes’?

Added gtk, theming

I think the theme directory should work.

Flatpaks may not be coded to even read themes there as otherwise they would always error out and use a fallback theme? Just a guess.

This is also GTK4 where theming, to my knowledge, is unsupported and hacky.

Try out Gradience which is made for that.

Where should I be putting my themes? Doesn’t GTK recommend to keep themes in the ~/.local/share/themes? Maybe I should move them?
How do I know these are using GTK 4?
Gradience is unmaintained AFAIK and is used for theming manually, no?

I don’t know how it works through Flatseal, but I have always done:
flatpak override --filesystem=~/.themes

I think this is the default directory and you should stick with that.

Try Gradience, they know how to do this