VLC for Android 3.X documentation · Primary-source explanation; examples are illustrative. Instructions are based on publisher guidance; a UK IPTV account was not tested on this platform.
Read what the marker represents
VideoLAN VLC for Android 3.X explorer documentation includes Mark as played and Mark all as played actions. When the seen marker display is enabled, these can place a completion marker on thumbnails. Therefore a marked item does not independently prove that someone watched every minute. This distinction matters when sorting a personal library or checking whether a family member actually finished a programme before removing a local copy.
Use a small library organisation test
For an original example, choose a harmless short clip which has not been played, note its current marker, then use the documented mark action in a suitable test library. Compare the thumbnail state with the actual playback history and position information available in the installed version. Keep those observations separate. A batch action on a group can change multiple markers at once, so inspect which group or item is selected before applying it.
Choose the evidence for the task
A marker can be useful as a personal reminder or an intentional library tidy up. If the question is actual viewing, ask the viewer or use appropriately authorised activity information with its own limitations. Do not treat a local marker as a certified audience measurement or a remote provider account record. The documentation describes library controls and may differ across installed versions; this article reports no usage measurement, programme completion audit or UK IPTV account test.