thanks. i tried this but only lets me download DNG files that are in my camera roll. to do that I have to place them there one at a time on my phone.
Assuming you’re using Lr Mobile on an iPhone and not Android, that shouldn’t be the case.
In ‘All photos’ , the main Lr collection, top right hand corner, there’s an ellipse (...).
First menu item is ‘Select’. Select the photos you want to export.
Then choose ‘Share’ , at the bottom of your screen, and ‘Export to Camera Roll’.
Your selected photos, both jpeg and dng should be exported.
To go back to your original post, there are other excellent apps to test/choose from. Halide is one, Moment is another and saves photos , both jpg/heif and dng, directly to your camera roll.
There is one other, which has been my ‘goto’ for many years. ‘Manual Cam’. (LOFOPI.com) Inexpensive, single lens only but has one major plus: ‘takes photo on long press’ setting. Indispensable for eliminating camera shake in low light. Possibly superseded by the ‘bigger’ apps on the latest models - I don't know, I’m still on the ‘7’.
Hope the above helps.