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You can find this information here:

https://itch.io/docs/creators/html5#zip-file-requirements

  • The size of all the extracted content should not be greater than 500MB.
  • The size any single extracted file should not be greater than 200MB.

    -----------

    So right now, having a file larger than 200 MB already breaks the project.

    I think it would be good if this were mentioned in future Game Jams. But well, experience for next time.
(2 edits) (+1)

Thank you for responding to my question. I agree--the jam rules should include the link you list here. I bet not many people know about this. It'd be good to know this 200MB single file limit information ahead of time. I knew about the 1GB limit but not the 200MB. My first upload of my game had no problem, but the update of my final finished game only a few hours before the jam closed had the error about the data file size. That was really panicky.