I have made a custom timeline track , and I need to set and save a tranform reference on my custom inspector.
At first, I cast the property “target” of the editor as my custom playable asset , and set the reference of the transform directly. Like this:

But when I close and reopen the scene, I find the tranform reference is missing.

Then I found the class ExposedReference may can resolve my problem. I try to use it like this:
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And I tried 3 kind of methods to set the reference value, but no one worked well.
So I wonder how to make it and if have an example is better, THX for any help!!!

