Are you running Resolve as administrator? Drag and drop from windows file explorer is not working for security reasons if you run an application as administrator.
I think Panagiotis means the other way round. With Resolve being run as Administrator you can drag and drop from Windows Explorer into the Media Pool. It works here.
Resolve Studio 19.1.3 build 7 Dell XPS 8700 i7-4790, 24GB RAM, 2 x Evo SSDs, GTX1060/6GB (572.16 Studio Driver), Win10 Home, Speed Editor, Faderport 1, Calibrated Eizo ColorEdge CS230 + BenQ & Samsung monitors for UI, Canon C100mk2, Zoom H2n.
If you run any windows application with "Run as administrator" enabled, drag and drop operations from windows explorer are not working, unless you disable UAC. It's a known windows limitation: https://superuser.com/questions/59051/d ... inistrator