If you dragged and dropped an MP3 file into iTunes, for example, iTunes plays the file from its original location rather than importing it into the library.
The location is displayed under the iTunes Media Folder Location heading. Open iTunes, click “Edit” on the main menu and select “Preferences.” Click the “Advanced” icon to display the location of your media library. If you’re having trouble locating your iTunes media library, use iTunes to find it.If the song you want to import from your iTunes library is not in the WAV or MP3 file format, convert it before you can import it into FL Studio.