Until then, following the guidelines in this article ensures your projects remain studio-grade, whether you're sharing on the Scratch website, embedding in TurboWarp, or archiving for future generations.
For a ZIP to function as an SB3, the internal structure must be flat. put files into folders inside the ZIP. zip to sb3 extra quality
Assuming you want to convert a Scratch project ZIP (or .zip containing project files) to a Scratch 3 .sb3 file with maximum quality (preserve assets), here’s a concise step-by-step: Until then, following the guidelines in this article