@MG ...Put Run IF as a first action and rest of the logic inside it. You Run If condition will be Name contains "invoice". Ignore case if you want.

 Thanks for the response.  So I created the Run-if as shown above.  It still starts an approval WF no matter what the file name is.  Any suggestions?

I ended up using a set a condition option that worked.  If I drop 10 files into a folder in the library and two of them have invoice or invoices in the name the workflow runs as expected.  Thank you for the inspiration.