Hi All,
I just managed to get my flow to work. Thanks to: yashag2255.
I have a SharePoint list in which teachers complete feedback on students. The form contains a selection of likert scale (choice) questions, which were all converted to numbers using calculated columns, plus a final average grade. Then, I created a flow as below:

Once the first 'create file' ran', I included the path from 'Documents' to the file:

Then, I needed to add the file name from the dynamic content again from the 'populate' flow and add (.pdf). Otherwise, I got an error saying that the file existed.

Regards!