I got 403 error when file uploads

Yes:

https://support.cloudflare.com/hc/en-us/articles/201303340-How-can-I-change-the-client-maximum-upload-size-

  • 100MB Free
  • 100MB Pro
  • 200MB Business
  • 500MB Enterprise by default

But, if you use a streaming upload or chunked upload CF won’t directly limit that beyond a 100 second timeout if the upload takes too long.

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