My problem is with my third website: http://www.gonaturefolk.org. I am using the GP Premium Service theme. I’m not sure what is causing the underlying problem, but in the customizer under “Site Identity” I am able to successfully upload my logo into the “desktop and table” views and adjust the size of the icon accordingly (i.e. a guitar), but in the “phone” view – nothing changes, , i.e. it retains the “s” logo that comes out of the box with the GP Service theme. This is confirmed when I view the website on my phone. It shows the “s” logo, not my guitar.
Other notes: (1) The “s” logo is retained in the header throughout the entire website “in phone mode.” (2) The good news, and perhaps a clue: The content I added to the pages (i.e. services, home, about, etc.) does successfully show in all three modes (desktop, tablet and phone).