Is there a way to preview documents added via the upload URI?

I'm currently trying to upload a PDF via the upload URI that is retrieved from a different cloud service, and the upload step seems to be working correctly, but when I get to the polling stage for the job, I get a CORRUPT_DOCUMENT "The input file appears to be corrupted and cannot be processed." 400 error response. I suspect that my upload is incorrect and would like to test to see if the upload was correct or not in the first place.