CloudStor CLOUDSTOR CS-WV/1D - Manual (Page 28)

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You can preview a video by hovering the mouse pointer over
the thumbnail for a video. You can turn off this feature on
the Media Settings page by unchecking Preview videos when
hovering over video thumbnails. HTLM5 is supported for
compatible Web browsers. Select the HTLM5 video or audio
checkbox to enable this feature.