A. 1. Use a third-party video editing app: Download a video editing app from the Google Play Store that allows you to crop videos before uploading them to MuseClass. 2. Check for updates: Sometimes, features are added in new updates, so ensure you have the latest version of MuseClass.

B. 3. Provide feedback: While I won't suggest contacting support, consider leaving feedback within the app about the need for a cropping feature.