Is JotForm able to update salesforce records or only create them? Thank you!

Our SalesForce integration can either discard a duplicate entry or update an existing one. There are 2 duplicate check options:  

1. Always Update Existing Entry
2. Use SalesForce Duplicate Rules

You can choose your preferred way of checking for duplicates. Please check this user guide for more information: https://www.jotform.com/help/394-SalesForce-Duplicate-Checking

Here are the guides:

https://www.jotform.com/blog/54-Flexible-Data-Integration-with-Salesforce
https://www.jotform.com/help/321-Mastering-SalesForce-with-JotForm

Hope that helps. If you have any questions, let us know. Thank you.