Instagram is an online mobile photo and video sharing service which allows you to capture photos and record a video to share them with family and friends. You can also share your photos and videos to other social networking sites such as Facebook, Flickr, Twitter and Tumblr. You can capture a video from Instagram app, upload it on your Instagram account and share it with other people. You can also share videos that are saved in your phone's gallery. If you are facing issues while sharing a video that is saved in your Android phone's "Auto Backup" folder, then save that video in a different folder and then try to upload it again.