Can a requester include a comment before sending an approval? Can approver edit attachment?

ehernn2 what I would suggest is that you have your flow save the form into a SharePoint list. In that list you have a column with a JSON-formatted button that you or the requester clicks and which triggers a separate flow with a trigger of for a selected item and with a text input added. When you click the button it will open a panel that will allow you to enter a comment then run the flow. That comment could be added as dynamic content into the approval email.

You would need to change the button text, the ID of the flow to your flow's ID and to add any styling you want. 

{
  "$schema": "https://developer.microsoft.com/json-schemas/sp/v2/column-formatting.schema.json",
  "elmType": "button",
  "txtContent": "Press this button",
  "customRowAction": {
    "action": "executeFlow",
    "actionParams": "{\"id\": \"70bcc1be-c1af-436c-94a6-50828b1582ef\"}"
  },
  "style": {
    "background-color": "#460302",
    "color": "#ffffff"
  }
}

Rob
Los Gallardos
Microsoft Power Automate Community Super User