Vintage Green Review review for Google & YouTube

I installed Google channel and it automated a Smart Shopping campaign for me and it was working beautifully for about two weeks, but then Google Ads Manager prompted me to upgrade my campaign to Performance Max, indicating that ALL Smart Shopping campaigns would be switched to PM in July and that I should do it early to reap greater results sooner. So, as there was not an option to do this in the Google sales channel, I did it directly in Google Ads manager. Now, the old Smart Shopping campaign was disabled and the new PM is not getting as many sales. And, both Google Merchant Center and Ads Manager appear to have completely disconnected from Shopify. Conversions, budget, cost not updating in Shopify at all. When I go to the Merchant center, it tells me the I should connect Shopify's Google channel to advertise, but I'm already advertising! I'm concerned that my conversions are being missed, and that when I update or create new products in Shopify they will no longer sync automatically with Merchant Center or Ads but I have searched high and low for tutorials on how to fix this problem, as it's new. If google is forcing all Smart Shopping campaigns to switch over to PM, then surely this is going to be a big problem for everyone using Google Channel? PLEASE HELP! Thank you.