How to get WP-content sub-folders URL

Hello everyone!
I’m currently working on my website. I would like to know how can I get the URL of the file attachment?
For example, I would like to view the pdf file, its url is /wp-content/customer/storage/2fd0ec2d45497aaec0cb8070bc68600b/sample.pdf.

Here’s my code

<span><a href="/wp-content/customer-area/storage/2fd0ec2d45497aaec0cb8070bc68600b/sample.pdf" target="_blank"
        title="<?php esc_attr_e('View file', 'textdomain'); ?>" class="btn btn-default btn-sm">
        <span class="fa fa-eye"></span>
       </a>

I manually attached the file URL since I can’t able to locate each file.

so the subdirectories after “storage” is dynamic depending on the post file attachment.
So it goes like this:
POST TITLE: Sample post
FILE ATTACHMENT: sample1.pdf
The url can be: /wp-content/customer/storage/2fd0ec2d45497aaec0cb8070bc68600b/sample1.pdf

POST TITLE: Sample post 2
FILE ATTACHMENT: sample2.pdf
The url can be: /wp-content/customer/storage/2d640d09f7aa5b3ef83439168b7c99ae/sample2.pdf

Thank you in advance.