When I try to download the file to my Android phone, I get a list of 4 phones, and the one I want to use is “grayed out”. How do I highlight the phone and remove the other 3 from the list?
What file are you trying to download, and where from?
Greyed out devices in a download situation can often be because you have “Install Unknown Apps” disabled in settings on that device and are trying to install an APK that isn’t from the Google/Samsung store.