In general, you only need to meet your own team's compliance and privacy requirements, meaning you're only responsible for your own team's plans.
If external parties only need to read files that you send to them, they can access shared files via secure links and allow you to remain compliant.
Any external parties with whom you collaborate may want to subscribe to our Pro plan, depending on their own compliance needs. However, they are not obligated to do so.
Additional details about our plans and pricing can be found on our pricing page.