Chrome 80 Cookies Update Effect Dynamo Buttons
The most recent update from Chrome has effected Dynamo Buttons by redirecting constantly between Salesforce and Dynamo. Salesforce also published an article in this regard. Read more here.
This issue can be fixed by switching to Firefox for document generation, or disabling this SameSite Cookie in Chrome Flags.
Access chrome://flags/
Search for "SameSite by default cookies"
Click on the arrow and choose "Disabled".
Click Relaunch to reopen Chrome windows, login to Salesforce and use Documill Dynamo buttons normally.