trying to share a file .amr with whatsapp - The file format is not supported

Question

I'm not able to share an .amr file via whatsapp using API 29+, here is my code:

    Intent shareIntent = new Intent(Intent.ACTION_SEND);
    shareIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
    shareIntent.setType("audio/*");
    Uri uri=Uri.parse(nomeFile);   //nomeFile contains the full path of my file in "/data/data..."
    shareIntent.putExtra(Intent.EXTRA_STREAM, uri);
    startActivity(Intent.createChooser(shareIntent, "Choose your app..."));

this returns "The file format is not supported",

I also tried to put my file in an array and drop it into the intent this way

    File f = new File(nomeFile);
    byte[] buffer = new byte[(int) f.length()];
    try {
         BufferedInputStream bufferedInputStream = new BufferedInputStream(new FileInputStream(f));
         bufferedInputStream.read(buffer, 0, buffer.length);
         bufferedInputStream.close();
         }
    catch (IOException e) {
        e.printStackTrace();
    }
    shareIntent.putExtra("com.myapp.myapp.file.amr", buffer);

but the result is "sharing failed please try again"

any help is very appreciated, thanks