.Greetings...... "Hi, I'm Don (aka MOLurch) and I look forward to helping you!".I assume this is the Front Door.Likely the Regulator has broken, as they are a cable type & if you were able to pull window up, without much force, then replacement may be needed.
You need to remove the Door Panel & inspect the Window Regulator & also test the Window Motor to be sure it is also working
IF you need Door Panel Removal procedures, just post back
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Thanks for the quick reply. Yes, this is the passenger front door. How easy would it be for an amateur to remove door panel? Sounds tough. Should we just bring to a mechanic?
IF you have never replaced a Window Regulator & /or Motor, then this can be challenging.
here is Audi Door Panel procedures