I could just get my files on removable storage by action_open_document tree and it gives me a document file. I can not open this file with Action_view. The URI from document file did work! I can open image file with action view .
String uri=DocumentFile.getUri.toString;
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(uri);
intent.setDataAndType(Uri.parse(uri), "video/mp4");
activity.startActivity(intent);
Other apps do not have access to that content. Add FLAG_GRANT_READ_URI_PERMISSION
to the Intent
to pass along your own read access to the third-party app.