When I receive an email containing automatically generated PDFs, the screen looks like this:
The attachments are there, however.
I don’t know if this of relevance, but I will mention it:
I did a test with my Android phone and I noticed that the file name of the PDF began with UTF-8" and any spaces between words were filled in with code. So, instead of “CAOKRC-1222-0049 02 (1)”, the file was named UTF-8"CAOKRC-1222-0049-02%20%281%29.pdf.