Opening text messaging app with attachment

I'm trying to start an Intent from a Unity app that will launch the text messaging app with an attachment.

I have been able to open the text messaging app but the attachment does not load properly, throwing the following exception:

'Could not determine type of file:///storage/emulated/0/Android/data/com.torpedoesaway.memematch/files/Gifit2MemeFiles/gifit2meme-2019-09-7-09-39-54.gif java.io.IOException: java.lang.RuntimeException: setDataSource failed: status = 0x80000000'

Note that I have also tried loading other images, such as pngs and jpgs, all throwing the same error.

This is my code:

Intent intent = new Intent(Intent.ACTION_SENDTO);
intent.setData(Uri.parse("smsto:" + recipient));
intent.putExtra("sms_body", message);
intent.putExtra(Intent.EXTRA_STREAM, attachment);

if (intent.resolveActivity(activity.getPackageManager()) != null) {
   activity.startActivity(intent);
}

I tried playing around with the intent action as well as the setData/setType calls and in one instance I am able to open the chooser, select the messaging app and then the attachment is loaded properly. However, I want to open the text messaging app directly with the attachment working.

Thanks in advance for the help!

Edit:

How I'm making the call from Unity:

AndroidJavaClass Uri = new AndroidJavaClass("android.net.Uri");
        AndroidJavaObject uri = Uri.CallStatic<AndroidJavaObject>("parse", path);

        unityClass = new AndroidJavaClass("com.unity3d.player.UnityPlayer");
        pluginClass = new AndroidJavaObject("com.torpedosaway.giftomessage.Gif2Message");
        pluginClass.Call(
            "ComposeMmsMessage",
            "53876045",
            "message",
            uri,
            unityClass.GetStatic<AndroidJavaObject>("currentActivity"));

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