Show attached files in mobile app: Screen vs Pop-up

We has a section in our mobile app that designed as user feedback service. And faced with question - how the best way to show user their attached files on screen with new form creation? User can attach maximum 10 files.

On our form we already use three input fields (two fields for choose only one value from several items and one for simple text input). Also one of fields for choose one value from several items we design to show this values inside popup because value has complex structure (not only title but also a little description for each item).

And then when we design a feature with optional attach files to our form - we faced with a question - how the best way to show already attached files to our user - continue to show it inside a popup at the same form screen (similar to our context with already used popup for one of our form filed) or using for this scenario separate screen?

Requirements for showing attached files:

  1. Show a list of attached files;
  2. Delete attached file;
  3. Open attached file.
  4. Back to screen with input form.

And also, does anyone know any examples of implementing a popup in mobile applications that provide a list items inside and support delete action for every item?

Thanks in advance!