In this new update (version 1.0.4) we've also updated the video option.
You can now import your own .MP4 videos. When you want to record the canvas, the recording can now be a maximum of whatever the video's length is.
(for example, if you upload a 3 minute video, you can record the full three minutes. (it'll be HUGE but you can do it)
More improvements on this front are coming!
To record a video, watch THIS quick video :D