How to write files to external public storage in Android so that they are visible from Windows?

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What is wrong with my implementation?

MediaStore has not discovered your newly-created files yet. What you see in Windows — and in many on-device “gallery” apps — is based on what MediaStore has indexed.

Use MediaScannerConnection and its scanFile() method to tell MediaStore about your file, once you have written out your data to disk:

public void scanFile(Context ctxt, File f, String mimeType) {
    MediaScannerConnection
        .scanFile(ctxt, new String[] {f.getAbsolutePath()},
                  new String[] {mimeType}, null);
}

or, in Kotlin:

fun scanFile(ctxt: Context, f: File, mimeType: String) {
  MediaScannerConnection.scanFile(ctxt, arrayOf(f.getAbsolutePath()), arrayOf(mimeType), null)
}

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