Hi, my condolences to you, putting down a loved animal is a heart breaking moment. Background and wallpaper are kind of the same thing, different phones might word them differently. Wallpaper is a term used for your home screen 'background' or your lock screen 'background'
Your phone is looking to set the home screen wallpaper as a scrolling effect. Download this app - it'll set any image you have as the home screen wallpaper.
https://forums.androidcentral.com/e?...token=fQeyDKYY
All the best and please register with us if you have any other issues.