@neil_fifteen I came here to ask the same question. I cannot see how to export captures / share them. Would also be nice to be able to put a timestamp and other session metadata on the image if desired.
Early functionality that is not yet complete. I would expect to see this feature and more to be released in 2020.
You can use something like DU Recorder (iPhone app) to record video from a phone/tablet and then edit/save/publish it afterwards, there are numerous similar apps for IOS and Android so go with whichever suits you best. That is about the only option until such time that the functionality gets updated in due course.
iOS has a screen recorder built in, I just use that.
I found it crazy though that a screenshot I captured via my controller I then had to use my phone to take a screenshot of the screenshot in order to share it lol. Screenshot inception going on over here!