I tried it out with docs from my last refi. Tried both PDF and PNG files, both returned "An error occurred with processing your document. Please confirm you uploaded a valid Loan Estimate or Closing Disclosure PDF."
I also at first didn't notice there is action needed to choose between uploading a Loan Estimate vs Closing Disclosure. It doesn't seem insurmountable to have the site automatically figure out the difference between those two.
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