QNAP VS-2004L en - Manual (Page 108)

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iii. Select the recording type.
iv. Specify the time range when the files are recorded for each IP camera. The green
cells indicate regular recording files and the red cells indicate alarm recording files.
Click ‘Apply the selected time period to all the IP cameras’ to apply the time
selection to all the IP cameras.
v. Click ‘Preview’ to preview the video.
vi. Click ‘OK’.