Accessing files directly after asking for directory using ACTION_OPEN_DOCUMENT_TREE

I want the user to give me access to videos folder of his choice using ACTION_OPEN_DOCUMENT_TREE. Then, I want to detect subtitles file based on a video name. For videosample.mp4 I want to see if exists and then load it if it does. How do I detect the availability of the subtitles file(s) and how do I read it? Is it possible to read it using normal File class?

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