This article show three methods that can be used to add audio comments to PDF documents in Adobe Acrobat free and Pro version.

Merge PDF files, two or more, by using the Adobe Acrobat Reader Combine PDF function. Adobe Acrobat Reader DC is the cloud-based version of Adobe Acrobat Pro.

Adobe Acrobat Reader DC is a good free PDF reader that does what it says on the tin: allows you to read PDF files and manipulate them to some degree. It’s just a shame Adobe felt the need to ...