Images must be .jpg, .png, or .gif.
To provide optimal load times for your page, image sizes have been capped at 2MB. If you have an image that is larger than 2MB, you will need to optimize the image to a smaller size file. Images in the media area must be 700x365 pixels and thumbnail logos must be 320x320 pixels.
If you do not know how to optimize your image or do not have the appropriate software, you can do an internet search on "image optimizer" to discover a variety of tools (some are free) that will enable you to conveniently optimize your images.
Once you have an optimized image, you will be able to effectively upload your image to your page.