To upload a video from your camera roll:
If you're logging a climb for the first time:
Log the climb as usual, and under "More Options," go to "Performance Details."
Tap "Media" and add your video.
If you've already logged the climb:
Scroll down to "Edit Logbook."
Tap the ellipsis (three dots) next to the climb.
Go to "Performance Details," then "Media," and add your video.
To embed a YouTube video as beta:
Go to the climb page for the climb you want to add beta to.
Find the Log Send (green) and Attempt (black) buttons.
Tap the ellipsis (three dots) next to those buttons.
Tap "Add External Media."
Paste the YouTube video link and follow the prompts to embed it.