Step 1: Go to Media Tab
Click on Media under Side-menu
Then click on Upload Button.
Step 2: Upload Box
In the Upload box, click on Browse which will directly open you to your local storage, select an image/video from it or you can also drag a file and put it in the space provided.
Click on Upload.
A private option is available if you want to upload media publicly or not.
Your image/video will be added to your Media.
Step 3: Cast Image/video
Click on the Action icon, then on Cast.
Select Screen
Select screen box will appear, click on the screen where you want to display your image/video.
Then click on the cast.
Step 4: Cast Successful
Your image/video will be successfully cast to the selected screen.