But the app wouldn't let me pre-save an address. So I had to write it down to type in to my phone later. Strike one.
For this surely the natural place to store an address is in contacts, isn't it?
Then you can select the address in contacts and choose "Uber" as the app. At least it works that way on my android phone.
For the rest, I've also recently started having problems with the app.
I made the mistake of updating the app just before I went on a business trip, and found Uber was only
intermittently working for me. (I had planned to rely on Uber, rather than renting a car which I'd previously done on similar trips.)
I find it amazing that they didn't test their app better before making changes when their whole business is centered on a working app.