'Submit' button is active although no document is uploaded in the Office Document Viewer Macro

Steps to reproduce:

1. Edit the page
2. Click on "Insert" Button (the "+" icon)
3. Click on Other Macros
4. Search for Office Document Viewer and click Select

Expected results:

The "Submit" button is disabled and becomes active when an office file is uploaded.

Actual results:

The "Submit" button is active.