Here's how you can choose the fifteen seconds of video you want to share via the Instagram app on your mobile phone.
1. Open the Instagram app.
2. Go to the video you want to share.
3. Put your finger on the video strip at the bottom, then slide it to where you want the video to start playing.
4. Drag the blue slider over the video to pick where your video will end.
5. Tap on Add at the top to share your video.
Read more: Instagram Help
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