Hello mdhugol,
simply put a field based on the plugin code "afterstore" in your form.
Then in the field configuration, in the textarea "Free", write your code to create your field in the good folder.
To define the folder of the image, look at the variable with a dump( $fields['name_of_upload_image_field'] );
You will have all informations to store you file in the good folder.
The support is based on how to use those plugin, but we can't make all the custom code for you.
Regards.
Lionel