The MP3 audios are not Attachments, they don't show up on Adobe Acrobat Pro DC's Attachments panel, they show up on the Comments panel and Adobe Reader/Acrobat can only export them to an Adobe
.fdf file which is a data file like pdf.
Unfortunately, PDF files can't be opened as Archives, to extract files from them.
So how can I extract the MP3's? Any free Linux or Windows software that can do this easily?
I have tried these program's free trials, they either only show the comments (can't even play them) or just export to
.fdf or not event able to show comments or only extract attachments and images:
Ashampoo PDF Pro 2
Code Industry Master PDF Editor
Foxit Advanced PDF Editor
Nitro PDF Pro
Systools PDF Extractor
All latest versions as of 09-oct-2020