Why do I get a failure to convert my Manuscript PDF File into the system when it is PDF already?

Paragon Plus does some additional processing on uploaded files and likely causes for this issue are hidden text and digital signatures placed in the PDF file by the program used to convert the latex Postscript file (.ps) into a PDF.

The Paragon Plus PDF processing is most compatible with the Adobe PDF files.

If a different PDF file creation product such as Quartz or Ghostscript was used, it is recommended to open those files in Adobe Acrobat or Acrobat Reader and save them as Adobe PDF files before upload.