macOS Sierra Preview Extra Services When I highlight text and right click, I usually get this menu: 
Notice at the bottom where I have custom services such as &quot;Custom Text To Speech&quot; and &quot;Add to iTunes as a Spoken Track&quot;. This use to also be available in Preview when I would read a pdf but now only this appears:

I need this feature for custom services I use but it seems to not be available in macOS Sierra's version of Preview.
I am very happy to report that upgrading from Sierra to High Sierra (macOS 10.13.2) reintroduced the text services in PDFKit and therefore Preview.app (Screenshot of a German macOS where "Preview" is "Vorschau" but you'll get the idea):



Classical Apple giveth, Apple taketh away and giveth again cycle I guess...

Maybe this also leads to a more functional PDFKit on iOS.

Cheers everyone

Dennis