Hi again @ctammes!
I'm not sure why file upload isn't working right now, but you could try uploading your screenshots to a service like Imgur.
I'm getting the same error, and have passed it on to the internal team so they can fix it. Your best option may be to wait a day or two, then come back to the course
but I am wondering if this is really a serious site. It seems a bit crappy to me.
I understand why you think that. In these past few days, there have been a lot more errors reported in the Rails course than usual, and I'm not quite sure why - I'm guessing something changed internally that broke a lot of stuff. I'm not sure which other courses you're taking, but at least for the Rails course, you just happened to start at a bad time.
Not that that's an excuse for the poor quality you've been experiencing, I'm just trying to explain it.