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You have to have a mod ready in order for it to be uploaded alongside your workshop upload. You can create your own using this guide, or you can mooch off of other people use other people's content in the upload. (Don't forget to credit them in the description!)

Press "O" on the level you wish to include the sprite mod with. Then, create a new folder named "mods" and place the .patchwad files inside the "mods" folder. This will ensure the mod only effects this one level, and not every single other level the player has downloaded.

Playtest the level to ensure the mod is working, then upload it by pressing "P" on the level/campaign. After you've completed the level/campaign, you may upload it. Make sure to note somewhere in the description/title that the level has mods, so people will be attracted to it! Mods = New Content! (In most cases)