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The project.json must accurately map the MD5 hashes of your assets.

Note: This method only works if the internal folder structure is flat. If your assets are tucked inside subfolders (like /costumes or /sounds ), Scratch will fail to parse the project. Step-by-Step Guide for an "Extra Quality" Manual Rebuild zip to sb3 extra quality

Windows : Open File Explorer, click the tab, and check File name extensions . The project

For projects exceeding Scratch's size limits (10 MB total, 5 MB for project.json), consider: click the tab