我正在尝试将使用itextpdf生成的文档附加到gmail（使用intents）。它适用于其他应用程序（whatsapp，电报等），但电子邮件显示错误“无法附加到电子邮件”

val mDoc = Document()
val mFileName = SimpleDateFormat("yyyyMMdd_HHmmss",Locale.getDefault()).format(System.currentTimeMillis())

val mFilePath = Environment.getExternalStorageDirectory().toString() + "/" + mFileName + ".pdf"
val database = AppDatabase.getInstance(context = this)
/// Test
try {

    PdfWriter.getInstance(mDoc,FileOutputStream(mFilePath))

    mDoc.open()

    /// stuff 

}


mDoc.close()

val mUri = Uri.parse(mFilePath)
val emailIntent = Intent(Intent.actION_SEND_MULTIPLE);
emailIntent.type = "vnd.android.cursor.dir/email"
emailIntent.putExtra(Intent.EXTRA_STREAM,mUri);
startactivity(Intent.createChooser(emailIntent,"Trimite Emailul"));