Name the files you submit to a potential employer for their convenience and not yours: LASTNAME_JOBTITLE or LASTNAME_JOBCODE.
If you submit the file with your name and date it is not going to be easy to find.
If I’m the hiring manager, I’m not going to remember your name.
I’m going to remember the job title or code I’m hiring for and I’m going to open those resumes for a refresher when it comes time to make decisions.
Make it easier for me and I’m going to like you better. You have the kind of common sense I need on my team.