Hi all! So, I've just created two very simple poses for the Spy and created the animations normally. But to upload them is a problem; when I click "publish animation" a small window pops up saying "invalid filename:". These are the two files themselves: spy_watching_1.dmx and spy_watching_2.dmx.

Here is the file directory:
C:\program files (x86)\Steam\steamapps\common\sourcefilmmaker\game
I've tried to publish the files both together and seperately. I can view the files normally. I even exported the animations again as different files with different names, and none of them work. :( Please help me! Its my first time uploading to the Workshop, and I'm guessing the answer is something obvious I've missed. Thanks for any help!