Hi! Starting 04/01/2016 you will need office 365 subscription for editing documents in continuum mode.
Ha-ha!
blogs(.)office(.)com/2015/12/17/new-to-office-365-in-december-office-mobile-for-windows-10-phone-updates-for-apple-and-android-office-365-planner-preview-and-more/
Ha-ha!
blogs(.)office(.)com/2015/12/17/new-to-office-365-in-december-office-mobile-for-windows-10-phone-updates-for-apple-and-android-office-365-planner-preview-and-more/