HTC One M8 User Manual page 211

2. Browse or search for a video.
3. Tap next to the video title, and then tap Add to > New playlist.
4. Enter the playlist name, and then tap OK.
If you don't want to share the video playlist, select Private before
you tap OK.
5. To add another video to your playlist, browse or search for the
video, and then tap
6. Tap Add to, and then tap the playlist name.
To access and watch your video playlists, minimize the video screen and
then tap to open the slideout menu. Tap the playlist you want.
next to the video title.
Entertainment 211