What is a one-sentence summary of the following article?
You can send pictures and videos that you've previously taken or recorded on your device. This will display the pictures and videos that you've taken using your device's camera and that are stored on your device. You can send both pictures and saved videos. Two buttons will appear on the selected picture or video. When you have a picture selected and press the Pencil button, you'll be able to draw on the picture and add text. When you have a video selected and press the Pencil button, you'll be able to trim the video. Trimming video is currently only available on Android devices. Once you're satisfied, tap the "Send" button to send the picture or video to the conversation. It may take a little while to upload longer videos. If you're sending large videos, you may want to connect to a wireless network to avoid data usage.

Summary:
Open the conversation that you want to send a photo or video to. Tap the "Gallery" button. Tap the picture or video you want to send. Tap the "Pencil" button to draw on the picture or trim a video. Send the selected picture or video.