Windows 10: trying to delete photos from phone folder

Geuze

I have a PC running Windows 10.

I have an Android phone connected by a cable.

I see the phone model appear as a folder, as expected.

In that folder, I see Card and Phone.

I want to move many of the files on the SD card to the PC.

In Card, I see many folders, and I choose DCIM>Camera, where I see many videos.

I select these, Cut them, and paste into the general Videos folder in Windows Explorer.

I can now see them listed in the Videos folder, all good.

But they are still in the phone>Card>DCIM folder?

Is that normal?

Do I need to then delete them?

Or delete on the phone handset?