I have two nested compositions opened at once. It works fine but I would like to preview those two compositions at the same time with the scrub bar.
I tried to activate the "Always Preview This View" button (at the lower left corner of the comp) but this didn't change anything, the preview is done only on the timeline of the selected comp.
Is it possible to scrub/preview multiple comps ?
Not really. AE will only update the time marker if the comps are somehow linked in the first place e.g. as pre-comps or with expressions and the "Sync time of related items" option is set in the prefs. Still, due to how AE's render order works, there may be delays or the child/ slave comps never even update, even if you scroll through the parent/ master. There's simply no good way to do this reliably. AE is a dumb nut in that department.
OK, it's clear... I do character animation, it's not very easy to precomp and sync those properly. thanks !