From the Instagram feed, click on the video you want to save in the phone's camera roll. Click on the three dots at the bottom of the video and click on “Save to Camera Roll” from the pop-up menu. The video will be saved in the camera roll.

Instagram is a free photo and video sharing app available on iPhone and Android. People can upload photos or videos to our service and share them with their followers or with a select group of friends. They can also view, comment and like posts shared by their friends on Instagram.