Lightroom camera HDR images don't process

I shot several photos with the Lightroom mobile camera last night on the HDR setting. The first few photos merged, processed, and imported correctly into Lightroom, but several photos did not. The 3 individual bracketed photos the HDR camera takes show up in my library, but Lightroom didn't combine them and process them like it normally does. Is there some way to get the app to finish merging the photos taken by its own camera? Otherwise, how do I prevent this in the future? This has never happened to me before when using the HDR camera and I don't have another way to merge the photos at the moment.

I have a Google Pixel 2 running the most recent versions of Android and Lightroom.