The AirServer wallpaper can be changed from the (pin code protected) settings menu.
Note that you can only set a web address where the wallpaper is available (so not upload a wallpaper for AirServer onto the Neo screen).
Instructions
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Open the Settings menu.
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Open the ‘Functionalities’ submenu and click ‘AirServer settings’
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AirServer will now open and show its settings.
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You can now fill in the web address where the background image is available (e.g. https://www.example.com/myimage.png)
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You're done!