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