Attachment from external storage sending by mail

Hi all. It’s all in the title. I would like to send by mail an termsAndConditions.pdf included in the app directory. My below code is for with/without attachment; without attachment the code runs correctly but with attachment, the file is not found (line # 9).
I would very much appreciate if someone could tell me how to correct my code to perform this envoi.

fun Activity.sendMail(emailTo: String, subject: String, message: String, attachment: Boolean) {
    val intent = Intent(Intent.ACTION_SEND)
    var subjectToUse = subject
    if (attachment) {
        // send the "termsAndConditions.pdf file"
        val fileName = "termsAndConditions.pdf"
        val file = File(this.filesDir,fileName)
        if (!file.exists()) {
        val uri = Uri.fromFile(file)
        intent.putExtra(Intent.EXTRA_STREAM, uri)

    } else {
        subjectToUse =
            "$appName v.$versionCode ($versionName) $brand - $sdk - $versCode - $CPU_ABI - $lang_Country"

    val addressTo = emailTo.split(",".toRegex()).toTypedArray()
    intent.putExtra(Intent.EXTRA_EMAIL, addressTo)
    intent.putExtra(Intent.EXTRA_SUBJECT, subjectToUse)
    intent.putExtra(Intent.EXTRA_TEXT, message)
    intent.type = "mail/rfc822"
    startActivity(Intent.createChooser(intent, "Send Email using:"))

Any help will greatly appreciated.