Does LR-mobile use a copy of the imported pictures or just the link to the Folder in my mobile? Looking at the Memory used by the app, it looks like if its a copy (so I have all imported pictures twice on my mobile, if I do not delete it) .
It imports it, so yes takes up more space.
I you are a subscriber then these will sync to the Cloud.
Once synced you can clear cache to free up space.
Retrieving data ...