How do I upload a google verification file?

[Adam7]

If you want to verify your site with Google, choose the META tag verification method instead. You can copy the code and paste it into Settings > SEO > Header Code, then publish and verify.

[pstover]

Adam - I Moved to a new computer and Google Search Console wanted me to re-verify for access.  Using the Google list of verification options I copied the meta tag code and replaced my previous SEO header meta tag code with the new verification code - and reloaded my pages.  Worked perfectly, immediate access!  Thanks!!