Folder added on Android is not visible via USB

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I faced the same issue and rebooting either the Android device or the PC is not a practical solution for users. 🙂

This issue is through the use of the MTP protocol (I hate this protocol). You have to
initiate a rescan of the available files, and you can do this using the MediaScannerConnection class:

// Snippet taken from question
File path = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM);
path = new File(path, "SubDirName");
path.mkdirs();

// Initiate a media scan and put the new things into the path array to
// make the scanner aware of the location and the files you want to see
MediaScannerConnection.scanFile(this, new String[] {path.toString()}, null, null);

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