cannot send e-mails with txt file attachments - kotlin

Question

I wrote the following code to send an email with a text file attached through putextra, but the file is not attached with a toast message saying that the file cannot be attached. I don't know what went wrong.
mainActivity.kt
class MainActivity : AppCompatActivity() {
private val vBinding by lazy { ActivityMainBinding.inflate(layoutInflater) }
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(vBinding.root)
vBinding.button.setOnClickListener {
try{
val file = File("${getExternalFilesDir(null)}", "test.txt")
val fw = FileWriter(file)
fw.write("this is text TextFile")
fw.close()
val shareIntent = Intent(Intent.ACTION_SEND)
shareIntent.type = "text/plain"
shareIntent.putExtra(Intent.EXTRA_EMAIL, arrayOf("myEmail#gmail.com"))
shareIntent.putExtra(Intent.EXTRA_SUBJECT, "testTitle")
shareIntent.putExtra(Intent.EXTRA_TEXT,"test contents")
shareIntent.putExtra(Intent.EXTRA_STREAM, Uri.parse("${getExternalFilesDir(null)}/test.txt"))
startActivity(Intent.createChooser(shareIntent, "test Send Email"))
}catch(err:Exception){
Log.d("test", err.toString())
Log.d("test", err.stackTraceToString())
}
}
}
}
manifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools">
<application
<activity
android:name=".MainActivity"
android:exported="true">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<meta-data
android:name="android.app.lib_name"
android:value="" />
<intent-filter>
<action android:name="android.intent.action.SEND" />
<data android:mimeType="text/plain"/>
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
</application>
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
</manifest>
I googled and tried modifying the manifest file, but failed.