Im trying to upload a photo or sticker and no matter the picture it wont work, i put it in a png form and making aure it fits and its small but it wont work.
Hmm if it comes back with 400 there is likely something it’s not happy with. If there is anything sufficiently boring (but gives you the 400 message) that you’d be willing to share publicly, maybe upload one of the images to https://catbox.moe and post a link? Then the file can be analyzed.
I do know that some websites hand out different formats to save some money on bandwidth. As of yet discord doesn’t dick around with image types yet. It just passes stuff through.