At present there is no mechanism for providing a notice when an upload is rejected, so if you have a map or mod that you'd like to upload in-game, please take note of the following guidelines:
Provide a unique/descriptive name.
Please don't upload mods with single-character names or nothing beyond the map's tile size, etc. Otherwise, as the library grows in size these sorts of names will cause a lot of confusion. If you cannot come up with anything, even something like "Mynickname's first map" would work.
Provide an appropriate description.
It's best to describe the map to some degree so people know what they're getting. Again, no single-character descriptions that don't offer any information.
Only upload mods that work.
This hasn't been an issue thus far with Elemental mods, but always make sure to test them first to be sure they load properly before uploading them.
Do not upload another user's work as your own.
This has already been an issue we've had to deal with. If you're doing it under permission, note such along with the original author's name in the description and make sure that your version is sufficiently altered that it's clearly not a simple repost. If you do not have permission, you may not repost other users' work under any circumstances, and can expect any such uploads to be denied without consideration.
If you are a modder and see someone ripping your work that we have not caught, please inform us privately and we will deal with the issue appropriately.