I try to upload my custom background, but it doesn't show.

Most probably the picture you’re trying to import is too big. Please try reducing the resolution of the picture before uploading it.

How can you reduce the size of the picture? Using any graphic editing application, e.g. IrfanView (http://www.irfanview.com/).

How much should you reduce the size? Optimally the width of the image should be between 1024px and 1600px.

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