It uploads the image, but it gets deleted immediately. I had the same problem for some of my accounts as well, unfortunately. I asked support and they told me that it can't be fixed, so you have to find alternative way to upload images for that account (in my case, I use FL).
Your account got flagged by IG. It's not a problem from Igerslike
Thanks for clearing that up.
Is there anything I can do at this point, do I need to worry about the account being banned by IG?
If it's a new account just create a new one. If not you'll need to find another way of uploading pics and you should be safe