That’s not good. Cubeupload is an image hosting site which I have used for a couple of things. I used it here because I couldn’t upload pictures onto BlenderArtists for some reason (fails for large files).
I made up a jpeg version so you can look at it here:
It’s smaller so it doesn’t fail. Anything near 1MB and above seems to fail, with the larger the file, the more likely it is to fail.
I don’t know why it happens. I have been having trouble for the past few months now. I tested on a phone and a computer and the same issue still happens. Perhaps it is an issue with the network I am on. The error is reported as ERR_SSL_BAD_RECORD_MAC_ALERT on Chrome.