If a standard H5p activity is added to a Moodle course (e.g. not embeded, but added as an item in its own right). When this is viewed via the Mobile app, the activity gets cropped which in doing so, hides or cuts the 'action' buttons making the activity unusable.

As per the images shown in this forum post:

https://moodle.org/mod/forum/discuss.php?d=449095