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This might be a dumb question, but I can set a normal animation layer to 'Loop' with the post-behaviour setting, but when I create a CTG layer, there seems no way to get it to loop along with its source layer? Is there a way I'm missing please? Thank you.

Good point!
I think this should be added.

The Repeat exposures option (inside the layer) does work in both layer types, so i can't see why post behaviour wouldn't be possible.