TranscriptPad can import and play almost all videos that are compatible with the iPad. If you are having issues with the compatibility of a video file you can use the free Handbrake desktop program which is available for macOS and Windows (https://handbrake.fr) to convert the video into a compatible format. It has various presets to make the conversion process easy, with the Apple 1080p30 Surround option being a good choice for most situations. Please see this TrialPad support article for more details: https://support.litsoftware.com/what-format-do-video-files-have-to-be-in-to-play-in-trialpad