✅ Async PushButton Functions

public static async Task<string> PickPhoto()
{
    return await Task.Run(() =>
    {
        Task<FileResult> task = MediaPicker.Default.PickPhotoAsync();
        if (task != null)
        {
            FileResult result = task.GetAwaiter().GetResult();
            return result.FullPath;
        }

        return string.Empty;
    });
}


protected async void OnPickPhoto(object sender, EventArgs args)
{
    await MainThread.InvokeOnMainThreadAsync(() =>
    {
        if (MediaPicker.Default.IsCaptureSupported)
        {
            Task<string> task = await Utils.PickPhoto();
            if (task != null)
            {
                string filename = task.GetAwaiter().GetResult();
                imageFilename.Source = filename;
            }
        }
    });
}