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(6) Insert material: Click the icon to open the local storage or U disk image file, the
user can select the picture can be inserted into the whiteboard, the image can be
annotated and written; Another way is to have access to the camera device, can
Calling the camera to take a picture, and inserting the photographed picture on the
whiteboard, the picture can be annotated and written
(7) Replace the background: Click the icon
to replace the whiteboard background