When a student has an android device, they have PDF versions of our ibooks. This means they get all the information, just like in a paper textbook, but they do not have access to the activity widgets, or audio/video. This can be frustrating for the student.
In order to alleviate this, teachers are reminded that aside from Conversation classes, widgets are mostly meant to be used as a means of self study and review at home and not as activities for the classroom. When you do opt to use widgets in the classroom (there are some pretty good info gap like activities in some books), be mindful of the students who have PDFs and pair them with a student who is willing to share.
Another limitation of the PDFs is that a student needs time to physically scroll through the whole document in order to get to the right page. Please allow them this time.
A workaround for assigned homework widgets could be taking screenshots of the work and pasting them to notability. If the student does not have this app, an alternative, android-friendly version to suggest is Notepad+ Free. It seems to be very similar. Either way, students can simply do an exercise the "old way" by writing or circling the correct answers and either showing the teacher the next day for correction, or even submitting it by email.