The first rule of resumes is always send it as a PDF. Always, always, always send it as a PDF. It preserves your formatting while Doc versions may not.

The lone exception is if the ATS requires you to submit it as a Doc. So it goes in that case.

Your resume PDF should be titled Firstname Lastname - Resume. Resume reviewers often see the file name so don't be stupid. "Firstname Lastname rez", "Firstname 1(1)", "FIRSTNAME LASTNAME RESUME" and "Firstname Lastname - Resume (Finance)" are all sloppy and make you look bad.