Hello, aopree ,
Don’t worry, it’s okay, you’ve already got all the Premium features.
When you buy Premium Subscription for three units, you will receive all premium features for your units, however, the units remain of the Free type.
This happens because 3 units on one account can be used for free in the application but without additional functions.
That is, your units have already received an additional amount of megabytes and all the other benefits of a Premium subscription.
If, for example, you buy a Premium-5 subscription, then the first three of your units will remain with the Free subscription, and the two new ones will already be with the Premium subscription.
At the moment, this is the mechanics of how the subscription works.
If you have any additional questions, do not hesitate to write to us again!