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Not sure if you ever got an answer to this, but I am running into it as well and I think its due to the fact my PDFs are too wide for the service.
answered 3 years ago
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This is still a problem. INVALID_DOCUMENT_TYPE provides no information about what is actually wrong, more granular messages would be invaluable. In my case, I think that my documents are failing because they exceed page size limits, but there's no way to know for sure until you "fix" it and see if it succeeds.