Use the Photos app to trim the length of videos you take on iPad and adjust the portions captured in slow motion.
iPad User Guide - Apple Support (CA)
Merge duplicate photos and videos on iPad - Apple Support (CA)
Change and enhance a video in Photos on Mac - Apple Support (CA)
What is Final Cut Pro for iPad? - Apple Support (CA)
Find settings on iPhone - Apple Support (CA)
Help protect your vision health with Screen Distance on iPad - Apple Support (CA)
How to Add Slow Motion to an iPhone Video (Before or After Recording)
Use and customize Control Center on iPad - Apple Support (CA)
Edit portraits on iPad - Apple Support (CA)
Personalize your memories in Photos on iPhone - Apple Support (CA)
Trim video length and adjust slow motion on iPad - Apple Support (CA)
Send stickers in Messages on iPad - Apple Support (CA)
Edit Cinematic mode videos on your iPhone - Apple Support (CA)