The projector doesn't support protected Apps from smartphones because of copyright, such as Netflix, Amazon Prime Video and Hulu. But you can play these videos via HDMI connection like Fire TV Stick/Roku Streaming Stick+/Google Chromecast.
Due to this movie projector does not support Dolby sound. When you plug in a Fire Stick to watch a movie, if the projector doesn't have any sound, you need to change the settings on the Fire Stick display and sounds, then turn off the Dolby sound. Go to Settings > Display & Sounds > Audio > Dolby Digital Output > Turn Dolby OFF.