The default Magento 2 admin interface allows input type files such as text fields, radio buttons, dropdowns, etc.
Additionally, you can extend the functionality for store configuration to add custom Image upload control Magento 2 backend.
This post gives you the programmatic method for the same.If you are a Magento 2 developer, you may require to upload a file in Magento 2 backend such as a CSV file to import shipping rates, attach user manuals on product pages, upload logo image on a specific page, etc. For these tasks, you can add custom file upload control in Magento 2 backend using the below solution.
For more Info. visit: https://meetanshi.com/blog/add-custom-image-upload-control-in-magento-2-backend/