ATEN StreamLIVE PRO All-in-One Multichannel AV Mixer - Manual (Page 74)

StreamLIVE™ PRO User Manual
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A confirmation message appears when a USB3.0 or later storage device is
plugged into the StreamLIVE™ PRO.
Now you may configure the storage device’s record settings or format the
device manually.
Tap the File Name field to adjust the file name of the recording(s).