What information does Overwriting a Model update?

This is a question I’ve had for a long time, as I upload a lot of free models.
In Studio, whenever I update/overwrite a model, it takes 1-2 hours for it to show any change.

Furthermore, sometimes, the thumbnail changes, and sometimes it doesn’t.
As such, can someone tell me what is changed when you update a model? (description thumbnail, etc…)

The thumbnail are set automatically for mna specific view you can make it manually with a camera but I’m not sure

Yes, I am aware of that, but I am still questioning the other aspects.