Allow saving multiple attachments with same name

        val dir = File(Environment.getExternalStorageDirectory(), "QKSMS/Media").apply { mkdirs() }

        val fileName = part.name?.takeIf { name -> name.endsWith(extension) }

                ?: "${part.type.split("/").last()}_$date.$extension"

        val file = File(dir, fileName)

        var file: File

        var index = 0

        do {

            file = File(dir, if (index == 0) fileName else fileName.replace(".$extension", " ($index).$extension"))

            index++

        } while (file.exists())

        try {

            FileOutputStream(file).use { outputStream ->