All of my files are save to my One Drive.
I’m 67 - Im as literate on computer stuff as a caveman… 
That might be the problem. Saving files and working on them from the cloud has been a problem for many users. Lots of examples of corrupted files for users working on files saved directly to the cloud. In many cases, files that contain nothing but zeroes. In this situation it might be that access time is too long for the export. You might see about exporting to a location on the internal drive. You have to look closely at the path to make sure it isn’t a One Drive folder.
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Well, as a matter of fact, you are 100% correct - it IS a OneDrive folder!
Did you try exporting the PDF to an internal location? Did you get a successful export?