Cannot import DICOM data - Required information (patient name, patient ID, study instance UID) is missing from dataset

I’m using the latest version 5.6.2. It gave message “import completed: added 0 patients, 0 studies, 0 series, 0 instances”.

When I clicked “Import DICOM files”, clicked into the directory having lots of .dcm files, it said “no items matches your search”, but I can see all those .dcm files in window file explorer.

The error log displayed:
Required information (patient name, patient ID, study instance UID) is missing from dataset
Failed to insert file into database (required fields missing): C:/Users/xiebr/Documents/morphoDownloadCTdata/morphoCTdata/aotus19801/Aotus81/newAotus1342.dcm
Required information (patient name, patient ID, study instance UID) is missing from dataset
Failed to insert file into database (required fields missing): C:/Users/xiebr/Documents/morphoDownloadCTdata/morphoCTdata/aotus19801/Aotus81/new_Aotus_198010000.dcm
Required information (patient name, patient ID, study instance UID) is missing from dataset
Failed to insert file into database (required fields missing): C:/Users/xiebr/Documents/morphoDownloadCTdata/morphoCTdata/aotus19801/Aotus81/new_Aotus_198010001.dcm
Required information (patient name, patient ID, study instance UID) is missing from dataset
Failed to insert file into database (required fields missing): C:/Users/xiebr/Documents/morphoDownloadCTdata/morphoCTdata/aotus19801/Aotus81/new_Aotus_198010002.dcm

Edit: “When I clicked “Import DICOM files”, clicked into the directory having lots of .dcm files, it said “no items matches your search”, but I can see all those .dcm files in window file explorer.” – I understand that I need to load the directory, so I probably won’t see anything when clicking into the directory.