No matter what animation is applied to a shape it just shows the green arrow. How do I know which animation is applied? I'm trying to reverse engineer an old project and I have no idea how some parts were made because I don't know which animation is applied.
The animations, once they are on a media, just represent a change in Properties for the media in question. The different animation presets apply a pre-set set change to properties but the preset that did it is not stored with the project. The best way to see what the animation is doing is to open your Properties panel and then sweep the playhead across the animation to see which values are changing.
In reality, all animations are 'pre-built' custom animations with some pre-defined properties being changed. I almost never use those ones, I always use a 'custom' animation and change whatever I want to animate. It's more straightforward.
As Clint pointed out, once you drag an animation to your clip, it is just an animation, with the start and endpoint properties changing to whatever that particular preset was. It's hard to reverse-engineer those.
If you already have the old project, I think you can also copy-paste animations (the green arrows).