I am so sorry man. My bad. I can check RIU and see if there are more reports. I will see if I can try and upload here.
UPDATE:
It looks like there is an issue here on RIU. It could be Xenforo related or browser related. Try a different browser maybe. Seems that some are able to and some aren't. I know that I cannot upload normally with Chrome on my MacBook.
This is as far as I could get using Chrome's "inspect", "console" and the Xenforo hash for the request to upload in a new tab:
Shouldn't be that hard though...