Unable to share file using chooser intent and FileProvider

Hi I am currently having an issue when trying to share a file using a FileProvider.

In all but one test instance, the file is not available to the application selected from the chooser intent. Running the test, that was enable to attach the pdf document to an email, is now also failing.

Further to this, if Gmail is selected as the share destination and an email sent, the body of the email has appended to it, this is not in the value that is added to the intent with the ExtraText flag.

I have checked the file that is being tested, and it is a valid PDF file.

From stepping through the code I am able to see that the file is in the files/pdf directory on the device.

The canonical file path is:
/data/data/com.myapp.identity/files/pdf/testdocument.pdf.

The absolute file path is :
/data/user/0/com.myapp.identity/files/pdf/testdocument.pdf

The following is the contents of the providers file

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="...">
    <files-path name="pdfshare" path="./pdf" />
</paths>

The following is the method used for sharing the file.

public Task Show(string title, string message, string filePath)
{
    //  Create a Java file instance, to be used by the file provider and check that the file exists
    var pdfFile = new Java.IO.File(filePath);
    if (!pdfFile.Exists())
    {
        //  The file that is being shared does not exist so throw an exception
        throw new Exception("Unable to share file; File does not exist at specified path");
    }

    //  Get a URI for the file from the file provider to enable sharing
    var pdfUri = FileProvider.GetUriForFile(CrossCurrentActivity.Current.Activity, AUTHORITY, pdfFile);
    //  Get the mime type for the URI
    var mimeType = CrossCurrentActivity.Current.Activity.ContentResolver.GetType(pdfUri);
    //  Create the intent for the chooser with the required permissions
    var intent = new Intent();
    intent.SetAction(Intent.ActionSend);
    intent.AddFlags(ActivityFlags.GrantReadUriPermission);
    //  Add the PDF to the intent and set the mime type for the data
    intent.PutExtra(Intent.ExtraStream, pdfUri);
    intent.SetType(mimeType);
    //  Add the additional details to the intent, incase email is selected
    intent.PutExtra(Intent.ExtraSubject, title ?? SHARE_SUBJECT);
    intent.PutExtra(Intent.ExtraText, message ?? DEFAULT_TEXT);
    // Create and display the native chooser for the user to select an app from
    var chooserIntent = Intent.CreateChooser(intent, "Select App to share file");
    chooserIntent.SetFlags(ActivityFlags.ClearTop  | ActivityFlags.NewTask);
    CrossCurrentActivity.Current.Activity.StartActivity(chooserIntent);

    return Task.FromResult(true);
}

I am currently unable to determine why this code is failing to enable the file to be accessed by the selected application.

I also get the same result if I use ShareCompat.

Can anyone help?

Thank you.