Generating target files from PDF source files in Studio 2021

Using Trados Studio 2021 and the online editor to translate a simple PDF.  I have Adobe Acrobat DC.

I created the project online, and imported the PDF.  Translation process was fine, but I was not able to generate a usable target file. The process generated an sdlxliff file, a .bcm file and a pdf file, which when opened in Adobe DC generated a "unsupported format or corrupt file error".  There was no .docx file generated, which is the case when generating target files from PDFs when using Trados Studio desktop. 

Any clues on what is going on?

My work around was to export the source PDF to a Word doc and then retranslate the entire thing, but that is not particularly convenient.