When importing a WAV file by drag and drop, it is not possible to drop the file on the “VOCALOID track”.

Drag and drop onto the audio track or to any other blank area.

Please also see the following videos.
https://www.vocaloid.com/en/learn/importing-vocaloid-sequence-midi-and-wav-files/

In order to prevent VOCALOID from being started as an administrator, please try the following procedure.

■ Procedure not to start VOCALOID as administrator

1. Exit VOCALOID.

2. Right-click the "VOCALOID5 Editor" icon and open "Properties".

3. Open the Compatibility tab.

4. Remove the check from "Run this program as administrator".

5. Double-click on the VOCALOID5 Editor icon to check if drag and drop is possible.



In addition, the WAV file format that can be imported into VOCALOID5 Editor is as follows.
・ WAV (Stereo / Mono)
・ 44.1kHz, 48kHz, 96kHz, 192kHz
・ 8-bit, 16-bit, 24-bit, 32-bit float