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How to update the existed unstructured data to add metadata

Hi, I have unstructured data in the AI Application storage, now I want to add some metadata or structured data to them, thus that I can use them in the discovery engine API. Is there any possible method to complete this job? 

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Updated:
I've found a post , but it didn't say how to connect the unstructured data with metadata, if I want to do some operations depended on the metadata when I searched  them later.