Devonthink 3.5 and new (?) markup feature


is there a new markup feature since v3.5 (see screenshot)? Why is it grayed out for all kind of documents?


Bildschirmfoto 2020-05-18 um 10.00.20

That’s a default feature of macOS (see System Preferences > Extensions…) and supports only images & PDF inside rich text.

Ok, thanks. I knew that extension, but never saw it in DT before.

BTW, it doesn’t work with images (i tried PNG/JPEG/TIFF). PDFs in RTF works.