LR mobile not saving photos clicked in DNG format in Auto and Pro mode on iPhone SE 2020.

I am trying to shoot in DNG format on my iPhone SE 2020. Every time I click on the capture button it makes the sound as if taking a photo however the pictures are not being saved in my library and I dont see a preview image as well after the picture is clicked. Its only saving pictures taking in HDR mode as DNG. If I shoot in JPG format its saving the picture perfectly in all 3 modes i.e Auto, Pro and HDR. I have completely formatted my phone and tried to capture DNG photos it just doesnt work. LR mobile works perfectly on my iPhone 12. Please help.