Lightroom mobile : Your device storage is almost full

I've more than 2GB free on my iPhone X but Lightroom mobile keeps throwing "Your device storage is almost full" error while exporting image to device. It's the same even when I switch to a new iPad with over 50+gb of free storage, so it can't be device storage issue. Neither I use Adobe cloud storage so that's free too.

It sometime works when I go to settings & clear app cache but not always. I hardly have less than 10 photos that are not heavy within Lightroom and have to keep deleting ☹, but it's been a constant struggle & frustration with exporting the work!!

Really I wonder how come no one facing this issue!! Very frustrating to work with this issue!!

 I do have the latest version of the app as well as latest iOS update. And I ve a monthly paid subscription!!

Any other suggestions?