Enable comments/converstations on files in SharePoint

[CamCov]

Hello,

I would like help enabling a feature that allows comments to be added to files within the Properties form, or the details pane of a file.

On list items in the same site, I have the ability to create conversations through these icons:

But for the document libraries, this does not appear to be an option? 

While looking into how to enable this, I did find a post showing it working as expected -> 6 ways to add comments to documents in SharePoint | SharePoint Maven

So I am just wonder what is different with my document library and where I should look to enable. I am the SP admin for the company, so I should be able to change any settings necessary. 

[#2]

Hi
Comments is native for Office files, so i think the comment option in the property panels only appear for non-office client. Put something else than an office document and check, the comment will appear in the property panels.

[#3]

@Vertebre Nope. Doesn't work for any files in my library office or not.