> ## Documentation Index
> Fetch the complete documentation index at: https://docs.box.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Box Hubs Known Issues and Limitations

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## Known Issues

<Warning>
  **Important**

  As of now, you can only invite users who have a Box account (any plan) to collaborate on a Hub.
</Warning>

### User and enterprise migrations

Migrations have a negative impact on all Hubs created in the enterprise:

* When a user migrates their content, the files and/or folders in a Hub become unavailable.
* Enterprise migrations make all Hubs unavailable.

## Limitations

* Shield's Information Barriers are not supported in Hubs.
* Version history is not available.
* As of now, Box Hubs does not work on mobile.
* There is no current file or folder limit for a Hub. However, Box Hubs is meant to have curated content, not to serve as a location for root folders.
* Hubs does not support an editable shared link to a Hub.
* Instant Login (admin only feature) doesn’t work with externally collaborated hubs. An admin can’t use instant login for a user in their enterprise and view content owned in another enterprise's hub.
* As of now, you can only add external collaborators using their main email address. Using an email alias results in an error **We were unable to add \[xyz] as a collaborator**.
* Hub collaborations are not shown in the External Users tab in the Users & Groups section of Admin Console.

### Box Hubs Limits

Restrictions for Box Hubs:

* Number of Hubs for each tenant - no limits.
* Number of Hubs for each Hub owner - no limits.
* Number of collaborators for each Hub - existing Box limits apply for number of collaborations for each item.
* Number of collaborations for each Hub - limited to 500. Group collaboration counts as 1, the group members are not counted.
* Number of members for each group that can be added to or deleted from Hubs’ collaborators list - existing Box limits apply.
* Number of paragraph sections in a Hub - no limit. \<90 sections in a single Hub allows for an optimal viewing performance.
* Number of files for Box AI for Hubs in a Hub - 20,000.
  * When the limit is reached, Box AI for Hubs responds with the following error message: **You have exceeded the limit of 20,000 items for this Hub. Box AI is now disabled. To reenable Box AI, remove enough items to get below this limit.**
* Number of files for Box AI for Hubs across all the Hubs in an enterprise - 10,000,000.

<Note>
  **Note**

  When either of the limits for Box AI for Hubs are reached, the AI service responds with an error message.\
  Only the first 4 MB of a document is indexed by AI.
</Note>