This displays the Movie Properties dialog box.
This displays the Entity Picker dialog box.
This displays an upload file dialog box.
Once you have located and selected the audio file, click Open to upload it.
Once the file finishes uploading, it will show in the file directory listing and will be selected by default. Click OK to continue.
The editing display will show a place-holder for the audio marked "Movie". When the text box item is published the embedded audio player will be displayed.