I'd like to have a shortcut to create a PDF from a macOS files. It is the inbuild ones and I don't know why but create PDF does not show up in system preferences -> keyboard -> shortcuts. While "convert picture" does.
Can I access this via BTT anyhow? I need it every day for my work. 
I'd recommend to create a shortcut in Apple's Shortcuts app, these can be called from BTT:
(if it does not show up immediately after creating the shortcut, restart BTT)
Thanks will do. Do you know what I can do to get the converted image at the same folder location as the original? Can't replace Desktop in my example 
This should work (need to set the main folder to your user's folder)
Thanks! Almost:
"Get Parent directory" must be above "Make PDF..."
I can't think of a reason why the order would matter here, but glad you got it to work!
True. It was another reason, sorry. But it works.
And I must say: thank you again for your help. Why? In the first place I assigned Shortcut via System Preferences/ Keyboard/ Shortcuts/ Services. But those aren't reliable here under macOS Tahoe and before anymore. (I gave up on Apple due to so much bad things going on.) Sometimes I got my JPG/ PDF, but after that I get the system audio error sound. Nothing is going on anymore.
Now I assigned Shortcut via BetterTouchTool. It works. Job Done. Cheers!
Only thing I adress again within BTT.app: I don't like its UI anymore, I got always weird columns. It is so hard to work with it for me. Please see the orange line-dots below the 2nd picture. I want them to be fixed forever, in percentage (as depended on BTT in full screen, half screen, etc.) 
unfortunately a percentage based approach does not work unless you keep the window at a very large width all the time.
You can change some of the minimum widths here, maybe that will help you:
The general resizing behavior of the split views has improved a bit with macOS 26.