Steps to reproduce

1. Create a blank page;
2. Drag and drop a file and check the storage format. It should look like this:

   <p>
     <ac:structured-macro ac:macro-id="3fa4b7be-699b-4675-83f9-15691f3470b5" ac:name="view-file" ac:schema-version="1">
       <ac:parameter ac:name="name">
         <ri:attachment ri:filename="pdf_sample.pdf"/>
       </ac:parameter>
       <ac:parameter ac:name="height">250</ac:parameter>
     </ac:structured-macro>
   </p>
   

3. Go to Cog icon > Add-ons > All add-ons search for Confluence View File Macro and disable it;
4. Back to the page, we see Unknown macro: 'view-file' instead of the dropped file (expected);
5. Edit the page but do not touch the View File macro. Save the page
6. Manage add-ons screen again, enable Confluence View File Macro;

Expected behavior
The files are displayed back properly.

Actual Behavior
Broken Macro message where there should be a file. The macro was corrupted during the page edit/save while the Confluence View File Macro plugin was disabled.
In the storage format, we see missing parameters in the macro structure:

<p>
  <ac:macro ac:name="view-file">
    <ac:parameter ac:name="name">pdf_sample.pdf</ac:parameter>
    <ac:parameter ac:name="height">250</ac:parameter>
  </ac:macro>
</p>

Workaround

1. Restore the previous version of the page saved before the macro was disabled.
2. Use the respective view macro depending on the file type (PDF, Word, Excel, PPT)