Here's how to take closeup and macroshots with the Ultra.
1) Set main lens to 2x zoom (or even experiment with 3x), this is critical to get around the edge blurring. Make sure you're set at the low megapixel setting and not the 108mp setting.
2) Find the the optimum distance to where you get the most close up detail while the camera can still be able to focus - you will have to tap and lock the focus. With more time and practice you should be able to get it right faster without much fuss.
3) Even after the focus is locked you might have to experiment with moving the camera ever so slightly further or closer - this is mainly more for macroshots of bug size objects. You shouldn't have this much fuss with taking a closeup pic of a phone sized object.