FOCUS Enhancements 3.2 - Manual (Page 29)

Quick Start Plug and Play
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6. Select the Upload Option:
a. a specific player,
b. a group of players,
c. all players,
7. Click Begin Update button.
When the upload completes, close the Update Control window.
The Firefly MZ loads immediately and begins playing back the
playlist. If using a schedule, the playback begins at the appropriate
time.
6A If uploading to one specific Firefly, select the Direct
Upload to Firefly option, otherwise leave unchecked.