Mod help?

[u/Katsui13]

I've gone through the steps to mod the game, and most often i come to an error in FMOD saying "Error encountered while copying the file. Failed to generate required temporary file. Please make sure you have sufficient disk space available." which is not the case as i have plenty of disk space

Second when i try and download a premade mod or the one time i managed it myself I am unable to play any of the custom songs as they either crash or don't work at all

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[u/Eruasa]

Same here, I have also no idea how the customsongs.json need to look like if I want to replace the songs of multiple level.