Hi @finnecs ,
So as @Jcook mentioned you can reference the documentation provided for the Update Flow connector, in order to get a better understanding of the Fields that are available.
In short the fields that are required are:
- Environment - The environment where the Flow is located. Can be a GUID or selected from the DropDown list.
- Flow - The Flow from the environment to act upon. Format can also be a GUID or selected from the Dropdown list.
- Flow Display Name - The display name to give to the Flow.
- Flow Definition - This will be the JSON definition of the Flow.
- Flow State - The state of the flow, which can be either "Started" or "Stopped"
Depending on the type of action you are doing you can for example reference a different Flow using the Get Flow connetcor.

And then reference its properties as dynamics values:

This can be useful if you would like to copy a Flow definition into another one.
If you want to start from scratch you can always manually insert the JSON code and perform the changes you need directly.
Hope this helps you move forward. 🙂
Regards,
Ricardo