Lightroom for iPad | working from 'FILES' storage concerns

If I am not planning to use the cloud as a back-up and am only using to edit photos on the go via my SD card reader.

If I am importing photos from a 'FILES' folder on the iPad,

Is Lightoom for iPad making new copies of my raw images, locally within the app?

Or is it simply making cache of the editting I am doing and working off my raw images by 'leaving the files in place' ?

Would love to the flexibilty to work out of 'FILES' so I can drag onto an SSD and not have to compromise more space within lightroom.

Thanks!

Hoping this question makes sense!