Voicethread is usefull app not only for teacher but also for students, you can create the PPP pand then you can export them to here, after that you can add text, audios, videos in order to explain in a better way the presentations,also you can add images, documents in order to make a better connection with the students.
One advantage is that you can check if all of your students have seen the presentation and if the classes are online is a very good way to make sure if they are watching the list and evaluate their assistance.
Click HERE to see an example
Click HERE to go to the website
Moises' Blog 