Nested if conditions

If you want to accomplish this and can't just use multiple AND & OR conditions in the initial trigger there's a couple of options:

[1] Use the base trigger to open a new layer and then add a 'on timeline start' trigger(s) to the layer that uses your additional condition(s). Make sure to add a final 'on timeline start - hide layer' trigger so you can re-show the layer.  You're kind of treating the layer as a re-useable function.

[2] Resort to Javascript!  I'd need to see an example of what you want to check to suggest how best to code this.  In general I would do something like:

• Set a true/false variable  (let's call it 'jsResult') to false.  You can also use numeric or string variables. Strings are most flexible but let's stick to t/f to keep it simple.
• Run the Javascript check & set jsResult to true if your condtions are met
• Add a 'when jsResult changes' trigger that carries out your desired action 'if jsResult = value true'

Does that make sense?