This is not what you want to hear, but if you pay Google you can get very quick support. The Google One product which includes cloud space and other features includes phone support for Google products.
Turns out, when you use free services, you don't get support, but when you pay them even just like ~$1/mo (I think my Google One for more photo space in the cloud is $15/yr?) they'll pick up the phone and answer anything.
I have Google One as well and while the support is quick, I don't have a good impression of their effectiveness when I asked a few basic questions (e.g. while GPhotos uses my overall quota, is its content accessible from GDrive)
That's fair, and obviously there is zero way you're going to get face time with an engineer that costs them $200k+/yr, and instead it's going to be someone they've hired at a tiny fraction of that.
But that's true of nearly all consumer level support in all industries. Businesses pay big dollars for consultants and service level agreements for access to the higher level folks.
Turns out, when you use free services, you don't get support, but when you pay them even just like ~$1/mo (I think my Google One for more photo space in the cloud is $15/yr?) they'll pick up the phone and answer anything.