How set up a flow from make read a specific google doc using chatgpt?

How To
,
1

I want to set up a flow let ChatGPT read a google doc and making modification.
How can I set up

  1. should I use ‘Watch the new doc’’ or ?
  2. if i chose a specific google doc. the Make still let me choose which filde I need to put into as ‘‘Text content’’
    There are lots to choose but I do not think any one is the real content in this specific google doc.
    so what i should chose?