"When filler text is inserted, its starting sentence is chosen randomly." says the Help.
When I create a layout of empty text frames + want to fill them with filler text I need to select each frame individually, otherwise the option is greyed-out. – Maybe to enable different starting sentences? – Well, if I select frame by frame and apply filler text then all frames get the same starting sentence. To achieve different filler text for each frame I have to fill a frame directly after frame creation and repeat this 2-step process for every frame. – I assume the latter was not developed for a certain reason or purpose by design but rather is an oversight.
filler text var. contents.m4v