From the library screen you can tap the view selector icons to see just your photos, just your videos, or all the media in your library.
Pinching in on the screen will zoom out and let you view as many as 20 smaller-sized thumbnails at a time. Pinching out will zoom in and let you view 6 larger-sized thumbnails.
Tapping on any thumbnail will let you view, remove, flag, share, or edit (photo only) that item. You can also tap icons around the edge of the screen for:
“settings” (upper left) to access settings
“more options” (3 bars) to access more options
“albums” to view all the albums you have created or joined
“library” to view all your photos and videos
“camera” to take a new photo or video
“upload” to upload an existing photo or video from your phone

We’re always here to help.