I know that you can alter, opacity for example, of multiple layers at the same time by selecting the opacity property of each layer. But what if there are so many layers that you want to select a single property of many layers at once?
For example, I want to edit the value of the "mask expansion" property of a lot of layers, but don't want to go through and select "mask expansion" on every single layer. Surely there must be a way to select specific properties across multiple layers?
No, unfortunately there isn't. Such stuff is based on the property control actually being visible and being equally visibly selected. Unless you linked it with expressions, it won't sync without the properties being revealed and selected.
You can reveal the properties by typing "expansion" in the search box of the timeline panel.
Darn yeah that's what I figured. Ended up just manually selecting all 500 of them . There must be some script that can help! I searched forever lo.l