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Aug 10, 2015 5:06 PM in response to arikbornby patixa,The private discussions are how students hand-in homework. Using "Open in…" to select iTunes U is the other means of turning in documents. (Both options presume the instructor set the "Enable hand-in" flag in at least one assignment of the course.)
Regarding annotating PDFs, note that the functionality requires specific hardware:
Annotate PDF assignments in iTunes U - Apple Support
Finally, other threads reported that upgrading to iOS 8.4 addressed a lot of the issues people saw with 3.0, so I'd recommend the same.