How do I use ProWritingAid with Final Draft?

You can use the desktop app to review your Final Draft script.

To get started, upload your .fdx file to ProWritingAid.

The software immediately detects the script format and asks you if you want to use Script mode. Just answer "yes." This means it will recognize scene heading format and other script formatting instead of flagging them as errors.

You can see read more, here: https://prowritingaid.com/art/1236/prowritingaid-for-final-draft.aspx