It also allows you to backup your samsung device to your computer
I am having same problem with s21 fe unlocked on verizon my wife had same issues last year with s20 fe I have found no information either to figure it out. my wife says hers will eventually update but it takes several weeks of trying and failing.
Do a soft reset! Hold down volume down key and lock key for 30 seconds I can't believe this just worked on my s21 ultra since Nov! Came back on and instantly started updating finally