Remove Functionality of deleting images by users lower then Admin

Hello,
I want to ask how can i remove functionality of deleting images by user below admin. I want them to upload images and delete only those that are uploaded by them. They cant delete images uploaded by another user.

I used this code to provide functionality to other users

if ( current_user_can(‘customer’) && !current_user_can(‘upload_files’) )
add_action(‘admin_init’, ‘allow_customer_uploads’);

function allow_customer_uploads() {
$customer = get_role(‘customer’);
$customer->add_cap(‘upload_files’);
}

I want them only to upload and delete there images not other users.

Please suggest me something.