Directory upload file

Good morning

I use your premium system

Everything works correctly I even overloaded the mail templates etc.
However when I added a file upload field in the default form.
The file is added but the problem is that the added files are not visible in the WordPress library and if I delete the quote requests (the old ones) the downloaded files are not deleted.

Do you have a hook or a snippet code to allow me to delete these files when the request is deleted because over time there will be a lot of files or to modify the download destination?

In addition, currently the files are downloaded directly in wp-content/upload but not in a separate folder so it is impossible to delete them automatically