Adding audio comments to Acrobat can be done by directly recording the audio in Acrobat or adding a pre-recorded file. Take these steps to add audio comments to PDF in Acrobat Reader.

That said, free users can make certain changes to PDF files without a paid plan. As a free user, you can add comments, highlight sections, draw on a document, add new text, and sign documents.

3. Take Charge of Comments If your documents are reviewed by a group of people, you’ll appreciate Acrobat’s ability to add comments to PDF files.

If PDF Thumbnail & Preview are not showing in File Explorer, then use PowerToys or Freeware to preview PDF files & add Thumbnail Previews to PDF.

Can a free PDF editor meet your needs? Find out which of Adobe's PDF editing tools is the perfect version for you.