There is no sound in the videos I've posted or I'm trying to watch?

For sound to work in Edufii, make sure that your ringer (little switch on the side of the iPad/iPhone) is turned on. Many apps where sound isn't a core function require the ringer be turned on to play sound and Edufii is one of those. You also may need to give the Edufii app access to your microphone if your videos are recording without sound.