Adding the Google AdSense ads.txt file to the root (Squarespace 5)

Seems many people are struggling with this or think it's not possible to upload a Google AdSense ads.txt into the root, but in Squarespace 5 I figured out a simple workaround using a 301 Redirect instead. All I can say is that after 4 days Google spidered my site and the pop-up warnings disappeared. More details here.