When Submitting an resume & Cover letter electronically, should it be 1 file or 2 Separate?

Question

And if they are submitted together on 1 document, which comes first?

Answer 1

You'll get  a wide variety of answers here.  They're all opinions.

However, here is my take (opinion):

1. Cover letter as the main body of the email

2. Resume as attachment.

Sometimes, you may not be a precise fit for the position you are applying.  They'll keep the resume on file.  

The cover letter you might craft to the specific job.