markNewMediaItemFinished
Marks an item created / returned by createNewMediaItem as finished, i.e. that the content has been inserted.
After this Completable completes, the item will be returned by methods of this SOCommMediaClient.
Return
A Completable that completes after the action has been performed.
Parameters
uri
The Uri of the item to mark as finished, which has been returned by a previous call to createNewMediaItem.