If you see a restricted (no-sign) icon when attempting to drag and drop an audio file into FL Studio from Windows generally indicates you're running FL Studio with Administrative privileges. Check your User data folder settings are correct. Unable to drag audio files into FL Studio. How To Load MIDI Files Into FL Studio (2 Ways) …
How to Import Sounds into FL Studio - YouTube.FL Studio Tutorial - 12 - Adding External Audio ….How To Load MIDI Files Into FL Studio (2 Ways) ….