Lumia Video Trimmer is able to trim all clips captured with your Lumia device. Commonly these are H.264 with an .mp4 container. You can't trim a video which you have downloaded from web. Most likely it probably is not in the right format.
- Are there limitations for Hey Cortana on my Lumia?
- What to check if I can't sign in or create the Microsoft account on my Lumia phone during the initial setup?
- How can I train Hey Cortana on my Lumia phone?
- How does Hey Cortana work when Battery Saver mode is on?
- Will I get “Hey Cortana” voice activation after Lumia Denim update?