Hi
@Penni
We had a client contact us on this today. No matter what they uploaded, it was not accepted.
Here's part of the email I sent to them and this seemed to resolve things;
I made the cover logo 1024x576
I created a LOGO at 250x250
I created a POST with your image and some sales text
I uploaded an "exterior" shot at 720x720
I changed the image for the "team" to be "At Work"
At this time, each of those images are now showing online when I check in Google Search.
So the "exterior" and "team" were also at 720x720. This was a brand new GMB setup that was only created early in the morning. Give that a shot and see if things go through. All images were JPG and were under 300kb. Google's guidelines say under 10MB JPG or PNG. I used JPG for this client. Once I uploaded the images (around 4 pm Central June 6th) the images were showing in Search and KB a few minutes later when I searched for their name.