I have an avatar I want to upload; it is only 484 kb. I know the limit is 512. It is also 800x800 px. It allows me to add the image to my profile, yet it does not pop up in any form of visual format. I don't see it on my account here, nor do I see it in-game. Did I do something wrong? Am I missing a step? There is a file present; it gives me the "delete" option, but I just can't see it!

Try to add your avatar via atelier801 website. if you are on steam, only on windows it will work. Try to install transformice standalone

You need to do it ingame with the command /avatar but doesn’t work on ios saddly