When you have in the first flow a folder action (copy, move or create), you won't be able to reference the folder in a seconf flow if you want to take action if the task that has been rejected.

I have created a couple of Relay Flow (Contract Management and HR Onboarding) during the flow I create folder to collect more information from either a vendor a new onboard person, but when the flow get rejected and could not create a rejection flow (Second flow) because could not take action on a folder.

This could be important when we will like to have more than one document in the flow and could open a bunch of other use cases.