You need to specify the amount of storage you want to assign to your file server in GB.
Step 1: Select File Manager
From within Commissioning Console, click on the File Manager tab
Step 2: Specify size of your file server in Gigabytes
In the field labelled File Manager Disk Space (GB), enter in how much storage you want to be available on your file server.
The File Manager implements a quota limit set at 90% capacity to ensure service performance. On request, the Support Team can make this extra capacity available temporarily to assist with cleaning up near-capacity File Managers. If you plan to run your File Manager at near-capacity, it is recommended that you size it for the maximum utilization plus an additional 10% to maintain performance.
Step 3: Save
When complete, click Save.
Now please read the article Configure Custom virtual machines