Transferring PDF files to Computer from IPAD

I have an IPAD pro and have few PDF documents on IPAD that, I   downloaded using Safari, and made them be available for reading via Adobe Digital editions. These are DRM free documents.

I connected my IPAD to my computer , and attempted to transfer these PDF documents to  my computer using iTunes via the file sharing feature. Unfortunately, in the file sharing window of Itunes, I am able to view only  epub documents that were exist on the IPAD but the PDF documents are NOT being shown.

Can someone please suggest, a way to transfer these PDF documents to computer or am I stuck reading them only on IPAD.

I appreciate the help.