This flow helps to admins to build quick roll up summaries on salesforce without writing any code. Please visit my blog to get more post like this: sfdcwiz.com/
Please , What is the type of the field ( Number of contact ) in which we display the result of flow and where we create it ? because in my case it seems like an input field :/
@@robertjenkin7805 Please check this link ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-fk8KbJ7o_pU.html . If that didn't work , let me know your details so I can reach out to you through email.