Cannot open PDF files received on WhatsApp directly

When I try opening a PDF file that I receive on WhatsApp directly by clicking on the WhatsApp message, I get the message, "You may not have a proper app for viewing this content". I already have PDF viewers installed on the phone (Google PDF Viewer, Adobe Acrobat Reader). I can open the file when I open it via a file manager. How can I open the PDF files by clicking directly on the WhatsApp message?