Make sure in the import dialog you select the correct option.
There are four options available.
1. Copy as DNG.
"Copy to a new location, import and convert to DNG"
"Copy photos to a new location and add to catalog"
"Move photos to a new location and add to catalog"
"Add photos to a catalog without moving them"
Make sure to select the correct choice.
Hint, Lightroom will usually return you to the last optioned you used.
Regards, Denis: iMac mid-2015, 5K 27”, GPU 2GB, Ram 24GB, HDD 3TB, macOS 11.7.6 BigSur,; LrC 12.3, Lr 6.3.1 Ps 24.4.1,; ACR 15.3,; Camera OM-D E-M1