In the flying screen, select the top right hand (general settings) drop down menu. Then tap the three dots at the very bottom of the menu.. There you'll see an option to Cache video during video shooting. Slide the button to 'on'. Once you've done that, you'll be recording the signal coming from the drone whenever you're recording. Note that it's only a max of 1080P and any glitches that might occur in the signal during flight will be recorded.
You can view and edit this cached video on your iPad. On the DJI Go screen that appears when you open the app select Editor from the bottom row. (To get to the startup screen when on the flying screen, tap the DJI letters on the top left side of the screen).
Once you've selected Editor, the editor screen will pop up. On the top of the screen, select Album and then Videos. You will see your videos there.
Also.. If the craft is powered up, you can view what's currently on your MicroSD card by tapping the small arrow in a box icon on the lower right hand side of the screen.
Not sure how you'd make your video available on your computer and other devices. There might be some way of doing it through iCloud, but it's something I've never explored.