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This free app allows you to trim long videos into short clips that can be added to your story or post. Here’s how to get the app:  Open the Play Store. Type story cutter into the search bar. Tap Story Cutter for Instagram in the search results (it’s the pink and orange icon with a white pair of scissors inside). Tap INSTALL. Now that it’s installed, you’ll find its orange and pink scissors icon in the app drawer. It’s at the top of the screen. A list of videos will appear. A pop-up will appear. The free version of the app only allows you to cut the video into 10-second segments (this is fine). Story Cutter will now cut the app into 10-second clips.  If you have the paid version, you can select 15 sec. Don’t close the app while the video is being processed. This shows the video broken up into clips as it will appear in your story.
Install Story Cutter for Instagram from the Play Store. Open Story Cutter. Tap Gallery. Tap the video you want to post. Select 10 sec and tap SELECT. Tap VIEW STORY on the confirmation screen.