Photos being scanned - Normal?

Hi all,

Probably a noob question but here goes.

CE 9.0.3, Odroid N2. I have an NFS share on my NAS with 1000’s of photos in various folders. Each time I select a folder I get the message “loading media information from files” and a progress bar. I must wait for this to finish before proceeding.

I would have thought this would be just creating the thumbnails and once done would not repeat itself. But this does not seem to be the case.

Is this normal?