title: getting content uri of already downloaded video in android Q
body: <p>i still don't understand the change made on access media files in android Q. My app downloads videos, but playing or retrieving the video gives error.</p>
  <p>Noticed, for android Q, every media file outside of app specific folders need to be registered in the contentresolver. In which the content resolver gives a special id to that file in return. Am i right?</p>
  <p>if so how do i register a media file in content resolver and at the same time get the uri of the media file</p>
  <p>A good explanation on accessing, saving and opening media files on android Q will be appreciated for a better understanding</p>