Face recognition in network folder

Hello,

I included a network folder to digikam which contains my images.
Unfortunately, I am not able to perform any options like face recognition on these files.

“Handy” is my network folder, “Bilder Backup” my local folder.
grafik

When I right click on “Handy” I dont get that many options like on other folders.

Options I have for the network folder:
grafik

What am I doing wrong?

Thanks and kind regards
Andreas