PowerLite 1221 XGA 3LCD Projector

Connect your USB device or camera to the projector's USB TypeA port, then switch the projector's display to the source you connected to the USB TypeA port. When you're done presenting, make sure you disconnect the device from the projector correctly.

Note: You can use the projector's Slideshow feature to present compatible images from a USB device.

Related references
Connecting a USB Device or Camera to the Projector
Selecting the Connected USB Source
Disconnecting a USB Device or Camera From the Projector
Presenting a Slideshow