Blogger import fails

Try reviewing https://www.wpbeginner.com/wp-tutorials/how-to-switch-from-blogger-to-wordpress-without-losing-google-rankings/

Yes, I’ve read the tutorials and followed them step by step. It’s a very easy, very simple straightforward process. My site gets all the way to to part where I upload the backup file and click Import.
Then the site refreshes and I get a totally blank screen with nothing but a SUBMIT button there.
This isn’t a matter of not doing the procedure correctly. My site won’t go past the next stage when I click “IMPORT”