Recognise subsequent changes to the same file

I have a rule which looks at folder of Notability PDFs and when a file is created where <Date Added> <is after> <Date last Matched> it is copied to another folder.
So far so good.
The issue is that it copies the file before it is finished. For example, I open a Notability file during meeting to take notes. Notability creates the PDF more or less as soon as I start writing and the Hazel rule runs. And that’s how it stays. As the meeting progresses I continue to add to the note and Notability continues to update the PDF. The problem is that Hazel has already copied the PDF to its destination folder and I can’t work out a rule to make sure the final version of the PDF is copied and moved.
So far so good.
The issue is that it copies the file before it is finished. For example, I open a Notability file during meeting to take notes. Notability creates the PDF more or less as soon as I start writing and the Hazel rule runs. And that’s how it stays. As the meeting progresses I continue to add to the note and Notability continues to update the PDF. The problem is that Hazel has already copied the PDF to its destination folder and I can’t work out a rule to make sure the final version of the PDF is copied and moved.