How to Update Opportunity Relate Contacts using Flow and Apex
Check out this video to solve this use case for updating related record and using a collection filter query which is not possible natively in flow but can be extended using flow.
Here is the link to code- https://github.com/pratima320/GetObje...
I only made a few edits to this - here is the main source and a website that I highly recommend for grabbing unmanaged components which you can also edit/extend for your own needs.
https://unofficialsf.com/automate-jun...