Trigger approval flow for file in library and update person column

[Mensur]

Since there is currently no "For selected file" trigger (only for an item), is there a workaround?

Here is my flow:

 

Is there an expression to get the ID once a file is selected after triggering?

Also, is there a way to update a person column? I'd like to add a person who approves a file to a person column - this would be very helpful (there can be multiple approvers).

Thanks.

[Mensur · Accepted solution]

Actually it looks like it's possible to use the "For selected item" trigger to run an approval for a particular file:

https://flow.microsoft.com/en-us/blog/flow-in-spo-document-libraries/

[Mattknott]

Do this flow but change the trigger to "for a selected item" in sharepoint. 

[Mohoelx]

How does one trigger "for selected item" against a file? The only option there is the Site and List. I have no List that the file is in....