If you're using a Chromebook, you should be able to set up a Studio account on the web via the Aurasma homepage. Then, you can upload the files you wish.
"We have had a lot of questions regarding Aurasma and creating auras. This is the start of many video tutorials to help you create engaging auras for your classroom, school, district or personal use. We hope these short videos help and get you excited to create your own augmented reality! "
Virtual whiteboard. Video & chat. High quality desktop sharing & recording. Real-time presentation: video, audio, YouTube,PPT, images, PDF
Alternative to google hangouts at elementary level.
uses quality text-to-speech to convert notes in presentation. This could be a way to get audio into Google presentations. Although it would require downloading as a MS PPT first and then inporting to this site.
Features
Context-based word suggestions
Text-to-speech with color highlighting
Integrated WebReader reads aloud text on any website and in pdf-files in the Google Chrome browser
Advanced customization options