Trigger a flow when a document has been approved

Hello,

I would like to build a flow, the trigger for which is 'when a document has been approved' but I cannot figure it out.

In a perfect world, I would attempt this:

  1. When an existing item is modified
  2. Get changes for an item or a file
  3. Conditions with AND clause
    1. Has column changed - Approval Status
    2. Is Value equal to Approved
  4. Do things

The issue I have is with step 3.1, the approval status column is not available from the dynamic options.
Is there anything special with it since it is not a 'typical' field?