wish,

I use Reaper, too, and drag 'n' drop works fine.

The "I could not create wav file" error suggests that you have not got the "Use VSTi/DXi synth" option active under MIDI Driver options. (#2 on the image below)

One of the quirks of BIAB is that the VSTi/DXI setting must be active to create WAV files.

Also, I know that Coyote Forte has been giving you issues. If that's still the case, for the drag 'n' drop process, simply select Coyote WT as the VSTi (#3).

Regards,
Noel

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Audiophile BIAB 2025