is there any way you can put audio files on the Record USB and play them back through the UI24. Seems like you can only playback the files you recored. You cant drag files to the record USB and expect to play them back. Any confirmation on this.
You need to place each audio file as the formal constructed directories for the unit.
Ui session maker application is useful to do it automatically.
Read this page.
Ui session maker application link is inside too.