The slide can be operated at Apple Watch
Is presentation viewer app

Click here for details
https://www.youtube.com/watch?v=Hwnjj_3kvYY

iTunes or, to synchronize the PDF file of iCloud Drive
I will do the slide operation of PDF.

The contents of the file you have selected the PDF from the list
In Apple Watch is sent to Apple Watch
By performing the slide,
Apps are also slide.

Slide file
Apple VGA adapter or, via AriPlay
It is possible to output to an external display