Laravel-Mail: How to pass ->attachData to view

The attachData method adds an email attachment and doesn't work for inline images. You need to add your image data to your $data_content variable and refer to it from there:

$data_content['attachedImage'] = ...; // Get the regular data of the image, not the base64 version

and then in your template use the embedData method:

<img src="{{ $message->embedData($attachedImage, 'test.png') }}" align="right" width="150px" height="100px"/>

If you need to leave the data as base64 then just pass the data into $data_content as base64 and use it this way:

<img src="data:image/png;base64,{{ $attachedImage }}" align="right" width="100px" height="100px"/>

You can pass data to your view as the second argument of send() method and it needs to be an array of data. Change your controller to -

Mail::send('mailtransaction', ['data_content'=>$data_content,'base64'=>$base64], function($msg) use ($to, $issueType){    $msg->to($to); // change this upon finishing    $msg->attachData($request->getBase64, 'test.png', ['mime'=>'image/png']);    $msg->subject($issueType);  });

And in your view, you can access data_content and base64 as-

{{$data_content}}{{$base64}}