Do you have the Windows version of iTunes installed on your PC laptop? If you do, you can attach your iPad Mini to your PC via USB. When it appears, select it, and then select Photos. You can now sync the photos from your "My Pictures" folder on the PC to your iPad Mini by selecting sync, apply. Without iTunes, I do not know how you can move the photos to the Mini without a third party app. The "iMazing 2" app for Windows can do it but it is not free. iTunes is free.