QNAP VS-2004L en - Manual (Page 92)

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To add one or multiple E-maps, e.g. office1 and office2, under an E-map, e.g. floor1, click
the E-map icon of floor1 and then click to add the E-maps one by one. The icon of
floor1 will be changed to when more than one E-map is added. To add another
E-map of the same level of floor1, select ‘Default’ and add the E-map, e.g. floor2.