"any platform" Are you saying .gif .jpg? or are you saying any forum?
And what size are the files you are trying to upload?
I have checked and you do have permissions to post images everywhere everyone else can.
So, your information needs to be specific so I can see what may be the issue.
Took a few pics from my apple ipad pro that failed to upload and then tried on my android phone which also failed. Said too large to upload, but I've never had that before as they're usually auto cropped.
Have you tried that image in this forum? Occasionally, very occasionally I hear of an image that just won't upload. I'm beginning to think that image may be one of those.
But will it upload in this thread?