I was trying to upload some levels I made awhile back to the workshop, and was unable to make my levels public. I asked for help on steam forums, and found that the levels I made weren't being uploaded properly, as steam was saying my workshop submission had a file size of 0.0 mb. I did some more testing, making a new test mod, and found that the settings.xml file of the mod contains this line of text
This is the 32 bit signed integer limit, so this field cannot go any higher. When I go to the workshop page for my item, the url ends in
It appears any mods I attempt to create will always have an id assigned to them by steam that is too high for Defender's Quest to handle, so I can't upload the actual files.