As we have test the moodle offical app video course in Iphone v11.04. it is working fine on first time loading. But when we re-open the same video course, it show the blank screen. After that each time, we have to clear the cache to work it again.
As we test the same issue with Iphone v11.02, it working fine.
Please find the attachment for the same issue.
this is a known issue, it will be fixed in the next release of the app. Please notice that, once the app has been updated, you'll have to delete the downloaded files that aren't working to make them work again.
Here's the issue about this: