I've klicked on publish button and got a error message at my last post.
I thought maybe it's a problem with the size of the attachment, so I've tried an other file and got no problems at publishing.
Now I've seen, that the first two attempts, that were stopped by a error message of this system here, were published too.
So fyi, I didn't want to make a double or tripple post.

Maybe you want to take a look at this behaviour too.