ViewSonic e-Posters do not support Power Point presentations natively.
There are 3 ways to achieve this purpose.
1.Use vSignage:
Models like EP4320/EP5520/EP5520T/EP5540/EP5540T have built in the vSignage. You are able to use the power point widget to publish your power point file from the computer to the e-Posters.
2. Connect and play from a PC/Laptop via HDMI input.
3. Utilize NMP players connected on e-Poster, edit and play the presentation in supported video format via Signage Manager software from PC/Laptop. Please refer to Signage Manager UG.