Cannot drag anything to Sample Control

The title says it all
I cannot drag anything to Sample Control.
It just shows a red “no no” mouse cursor.
I’ve tried external audio files, I’ve tried importing them to the project first, I’ve tried adding the file to a track first (that part itself worked fine) but then I cannot drag that audio event to the sample control
What gives?

Windows 11 pro. Cubase pro latest


What kind of file have you tried? I would try Stereo WAV file, 44.1KHz, 24bit first.