This issue should be tested on Android and iOS. Login into the app as student and search a course with a section that includes an H5P with a link to a page supported by the app (e.g. another activity) and full screen mode enabled. Click into the full screen button of the H5P (the full screen of the H5P itself, the little arrows). The package should be full screen now. While the app is on full screen, click in the H5P link. This should redirect to the desired page and the app should work as expected.