I work for an engineering firm where we have users who go on-site for construction monitoring, capturing photos and marking up documents etc. With the use of the Bluebeam Cloud on iOS (iPad).
With password complexity requirements, it would make it easier for users to be able to sign in by scanning a QR code from their already signed-in device (laptop/computer) during their preparations to go on-site, particularly for shared devices where users must sign out to allow another user to take the device on-site elsewhere.