Additional fields supporting "attach files" button on activities site

I’m quite sure that it’s possible but don’t know what kind of changes and where need to be done…
How to add some field on activities site (for example under the “attach files” button that will help to change title of uploaded file?

@niwciu, yeah there are WordPress hooks available for that where you can add field and can also handle title after file upload but the problem is that activity attachments allows multiple uploads and you will need to add custom fields for each files.