Specifically, for RAS assets you want to check for any references to external models or artifact files. During export, you can exclude any standard files or models because the consumer of your RAS asset already has access to those files. You also can ensure that you always include your referenced sample models and test files. As an option, you can save referenced files in your model's directory. This can help to simplify the RAS export and the later import by the user.
To validate the model: