@john32123666
Since yesterday I've (at last!) managed to upload one torrent, and also managed to add some pics to an existing torrent.
I'm more and more convinced that size does not matter, to say so.
In my own upload the contact sheet (.png image) was a 4.6 MB file, and was accepted immediately; on the other hand much smaller files (~ 100 kb) were rejected!
I've also observed that the same picture can sometimes be accepted a few seconds after being rejected (error 413 or error 500).
I suggest an explanation to this erratic behaviour: maybe at the very moment the pics are uploaded (whatever their size), if the server is occupied with another upload, it cannot handle both tasks and issues an error message.
Now, what baffles me: why now, first time since 7 years…?