Generated PDF is missing font will not upload to Amazon KDP
I recented edited an existing PDF with Adobe online, for which I paid for the premium online version. After downloading the edited PDF, I opened it on Acrobat and it tells me a message like "cannot find or create font Athanles. Some text may not render correctly."
I tried to upload the PDF to KDP as I get an generic error. This does not happen with PDFs created with other applications.
Can you please tell me how to fix this issue?
Thank you!
John