Not a Problem
I can't upload the attached file to my materials.
When I try to upload the new version by replacing the existing one and press the finish button, nothing happens. And if I press the saving button, it just says "Saving..." and after several hours it still say this.
I have also tried to upload it here, but can't. So here is a link instead.
The size of the file is 3.049 KB - don't know if there is a lower limit...
The same problem 
No issues here.
I've downloaded your file (shortened the file name, that it's too long for me ;) ) and uploaded it in a few seconds here.
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