I would always recommend checking compatibility of the device (phone-tablet) to the DJI software before buying, cause DJI drones are not cheap. Asus is not listed by DJI as a compatible device:
DJI Mavic Air – Specs, Tutorials & Guides – DJI.
I had similar problems with both Spark and Mavic Air using a Samsung phone. I switched to Huwawei Mate, I had one I wasn’t using, and use iPad
Mini 4 now.
You could try a good quality data cable to tether the RC to the phone as all USB cables may not be able to transfer data efficiently. But what you described seems to be DJI-Asus software incompatibility rather than anything else.
Having said that, I am sure you will find a fix for the problem you have with a little help on forums like this or YouTube tutorials which I have found very helpful resource.