I have a Huawei phone as well P20pro, and have had a lot of problems with the Lightroom camera app. I can't even get DNG option available, (DNG is supported) and until recently the app would only take in B&W. So, I would use the Hauwei camera app. It is way better than Adobe's. There seems to be quite a number of problems with Adobe and Huawei, and it could be quite a while before all these problems are fixed.