Hi Cammas,
I was having the same issue upgrading from my Samsung s9+ to the s10+ and could find no solution on the internet. I finally figured it out. Go to Settings --> Accounts and Backups --> Accounts--> Samsung account (should show your email address)--> Groups. Then click the appropriate Group. Members are listed at the top, and Supported Apps are listed below. Click Gallery. I had to verify my identity with a texted verification code and accept some terms and conditions. Then it takes you to your Gallery app where you can now see all of your shared albums! I hope this helps you!
