Symptoms
When performing an Import from file share, you receive the following error message:
You cannot break inheritance for this item because there are too many items with unique permissions in this list.
Details
In SharePoint, the supported limit of unique permissions for items in a library is 50 000.
ShareGate Migrate will work to preserve file share permissions for items that have custom permissions. If your import exceeds SharePoint's limit for unique permissions at the destination, you will receive an error message.
To address unique permissions you can:
Import the items without their custom permissions - During the Import from file share, open Options to disable Permissions from the Configurations.
Tip: Before you import your documents, you can create new permissions for your destination library, or create a few folders with custom permissions that your documents will inherit from to manage who can access the documents.
Import your content to multiple lists or libraries - Splitting the content over several libraries reduces the total number of custom permissions.