Hi Laszlo,

Currently it is not possible to monitor size of directories in the Microsoft Platform connector. Having a look at similar questions, I found the following one:

Do we have a connector that can monitor folder size?

However, the connector suggested in the answer only allows you to monitor files inside a folder, and not the folder size. A possible option is to request a new feature in the connector Generic Folder Monitor to allow folder size monitoring.

Hope it helps.