I have 4500 photos in Camera Roll, that I'd like to move to Lightroom and the sync with my desktop.
Problem is, that Lightroom iOS copies the images when importing and thus filling up my storage.
Is there a way to move not copy / duplicate images from camera roll to Lightroom iOS?
I don't think so Nils.
To stop doubling up, you could use Image Capture (if you use a Mac) or a Windows equivalent and copy your files to your computer.
Then use Lightroom Web in a browser and upload them there. They should then sync to Desktop and Mobile (but I am guessing on the Mobile it wouldn't download the original until you started to edit one).