Good Morning,
Based off your post its a little confusing at what you are trying to do but, from what I read I got:
You are trying to create a document set not a singular document so you are grouping documents by content type into one type of document in the library and I will work off that.
I would just create input variables for what you need with the normal Power Apps trigger make sure they are in the same solution(Power App and Power Automate Flow).
If you use input variables you can set the document library you wish to create it in.
Set Content Type = Document Set -> Set the title in a variable as well
Wait for the action above to complete then
Use the "Send an Email (V2)" action and send the documents URL (you may need a delay for this)
As for the approval (Yes No) field you have if its not a process longer than 30 days just wait you can create a secondary flow to catch that change occurring. Then once it says yes send the approval to the next user.
Follow up also to the "Ask in Power Apps"
Make sure you are using Power Apps (V2) trigger not the V1 I don't know any other reason that it wouldn't be showing unless you work in a restricted environment.
Hopefully this answers your question if it does please mark it as the answer if not please feel free to follow up.
Also if your goal is to just generate a file then send it through a review and approval process I know a better way to build this in a non-premium or premium environment but, it takes more setup.
Have a good one.