A standard archive tool (Windows built-in, 7-Zip, WinRAR, or Mac Archive Utility).
cd /path/to/your/project_folder zip -r ../fixed.sb3 *
Scratch has a limit on individual asset sizes (usually 10MB per sound or image). If your ZIP contains massive 4K images or long high-bitrate MP3s, the conversion to SB3 will "work," but the file will fail to load in the online editor.
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