GoPro recently updated its smartphone application, adding the editing capabilities teased earlier this summer by the company. The feature eliminates the need to wait until you’re near a computer to sync videos off the device, edit and then share.

To use trim-and-share, you’ll need the latest version of the smartphone apps. The iOS version can be found here, while the Android version is here.
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https://www.cnet.com/how-to/how-to-use-gopros-new-trim-and-share-feature/