It was tied directly to the onRefresh event listener.
When switching from manual to continuous mode while paused on a non-first frame, the viewer does automatically refresh that current frame before starting the loop. The result is a brief stale display (1–2 frames into playback). Severity: Medium
In "Motion" mode, the viewer operates on a tight loop, often synchronized with the vertical blanking interval (VSync) of the monitor. The refresh work here is constant; the frame buffer is cleared and redrawn at the refresh rate of the display (e.g., 60Hz or 120Hz). This is computationally expensive but necessary for smooth animation.
The standard URL pattern to access this mode directly is: http://[IP-Address]/ViewerFrame?Mode=Refresh .
If the interface is in a foreign language, you can sometimes force English or a default view by adding &Language=0 to the end of the URL string.
The existence of "viewerframe" results highlights a massive gap in digital literacy.