Reproduction steps:
1. Create a new Google account or use mine (created for a testing purpose - credentials in the edit).
2. Open the attached project.
3. Build and run it on an iOS device.
4. Press the "Record" button.
5. Wait a few seconds to record a video.
6. Press the 'Stop' button.
7. Wait a few seconds.
8. Press the 'Preview' button.
9. Press the share button (the ^ button - top right in landscape or bottom left in portrait).
10. Select YouTube icon.
11. Enter google account details.
12. Click 'Allow'.
13. Enter a title (it can be anything).
14. Hit the 'Publish' button

Actual behavior:
- Application black screens and becomes unresponsive

Reproduced with:
iPhone 5s iOS 9.3.3, iPhone 7 iOS 11.0, iPhone 8 iOS 11.0, iPhone X iOS 11.3
5.5.6f1, 5.6.6f2, 2017.1.3p4, 2017.2.2p4, 2017.4.3f1, 2018.1.1f1, 2018.2.0b4, 2018.3.0a1