To add your own custom image to a Document you create, follow the steps below:  

Step 1: Change the size of the image to a 16x9 aspect ration- that could be an image that is 1600 x 900 pixels or 800 x 450 pixels. Change the image size before attempting to upload it for best quality. 

Follow these steps to change the size of your image on a Mac:

  1. Open the desired image file using the Preview application.
  2. In the menu bar at the top of the screen, select Tools, then Adjust Size...
  3. A window should appear. On the right side of the window, click the box that states pixels and select your desired measurement.
  4. There should be three text fields along the left side of the window labeled Width, Height, and Resolution. Type 300 in the fields. 
  5. Select OK.
  6. Save the file. 

Step 2: Navigate to the Advanced Options. 

Step 3: Click Upload Thumbnail. 

Step 4: Select the image from your computer. 

Step 5: Make sure everything looks correct, and that's it! 

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