You can send photos to the calendar device via the APP. On the device page, tap "More" and select the "Gallery" module. (You need to allow the APP to access the media files on your phone.)
After entering the gallery page, select the photos you want to send, and place the key area of the photos within the white box, and then click Send.
(Note: Click icon 1 to preview the photo's display in both portrait and landscape modes. Click icon 2 to add a caption to your photo.)