Authorization Background Image
Optional. The authorization background image is the background of the authorization page for links that use the Custom Password or Email Access Code security option.
When selecting an authorization background image:
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Ensure the image has a JPEG file format.
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For best results, use an image that is smaller than 750 kilobytes.
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For best results, use an image that does not exceed 1920 x 1080 pixels. Images that exceed these dimensions will be resized.