How to get errors from an asset that failed to load?

[liquidhelium]

I want users to submit their file and my program will try to load them, and they will get the error detail when it failed to load.

I've checked AssetServer::get_load_state, but it do not provide an error.

I've also checked AssetServer::load_async, but it's a private function, and the error it returned is consumed in load_untracked.

What is the best approach to do this?