How to display Active Storage attached file when editing form?

I am building an Agreement management app. Each Agreement has vendor, activation, expiration dates and file. File is an attached agreement in pdf. I use Active Storage for attaching files. When I edit the form I don't see the attached file. As a consequence if I change any other parameter let's say vendor and update Agreement the previously attached file is being deleted.

What should I do to get the attached file name to be present on update and not being removed if I don't upload any other file while editing?