Hi! I didn't quite understand your comment... I think you're referring to the sb3 file. I have it, yes. But it has some errors caused by removing the extensions that were preventing it from opening in Cocrea, which is why I'm doing this recreation without any errors. I hope this comment is helpful! ^^
Viewing post in Sprunki shifted. The Great And Lazy Recreation (remake) comments
Well... it's a bit complicated. If it's an SB3 project, I highly recommend going to https://packager.turbowarp.org to convert your project to HTML. From there, go to itch, then "New Project," upload the file, and you can add whatever you want.
If it's another type of file, I honestly don't know what to do-
If it's an HTML file, and you want to convert it to SB3, I recommend this page: https://turbowarp.github.io/unpackager/