1. Select 
Groups
2. Select the group you would like to share a video in
3. Select the text field box that reads Share a Post to this group
4. Select the video icon 
and upload and share your video
1. Tap 
Communities
2. Select the group you would like to share a video in
3. Tap 
4. Tap the photo icon 
and upload your video
1. Tap Communities
2. Select the group you would like to share a video in
3. Tap
4. Tap the photo icon and upload your video