I don't wanna clog up the bug reports section with something dumb, but even after re-uploading my flags a few times today and the previous week (they were first uploaded a few weeks ago mostly) they still appear upside-down. This isn't too annoying for me, as I can just go over and re-format them off-site when the mod is completely finished, but I thought it might be worth mentioning.

(Appreciate your work a lot btw! This site is an incredible tool for getting into modding)

Just go to photoshop or whatever you using and make the flag upside down and import the upside down flag to your mod and the flag should be normal in-game.