Secure Guest User: Both for Visualforce Pages (/Sites) and Communities
How do you use Visualforce Pages and Sites to give external users access to a flow, so that they can read and/or create records in Salesforce? With Summer 20, you need to make sure that you secure the Guest User and give specific access to guest users with sharing rules, or use the brand new "run flow as System user without sharing" functionality. I made a Youtube video to show how it is all done.
Check it out here: https://youtu.be/tGvf4TqgJbE
You don't want to use Visualforce, you like Communities better. No problem.
The video for that is here: https://youtu.be/weoRR2qUu5o
Let me know if it is helpful. Enjoy.