How to add description to photos uploaded to the album vkontakte?

There is a task to upload photos in the album from the app. The problem is solved, all is loaded and works.
But an offer from the client to add to the photo description.
The idea is it should be pretty obvious and standard action for the API, but digging in documentation and in Google, I have not found the answer. Please tell me.
September 19th 19 at 12:21

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