Connect SP library to teams

Hello andy471100 

the teams tabs aren't permission driven, when you add an tab all the members can see the tab, regardless of the underlying entitlement of the library.

More about how you add to teams: https://support.microsoft.com/en-us/office/add-a-sharepoint-page-list-or-document-library-as-a-tab-in-teams-131edef1-455f-4c67-a8ce-efa2ebf25f0b

Or add cloud storage: https://support.microsoft.com/en-us/office/add-a-cloud-storage-service-to-teams-4e1e1a12-21ae-4616-b539-33d11e4cd68e

Workarounds for you<:

1. Create a SharePoint page and add a quicklink, activate target audience for quicklink to your library and add a group (only people in the target audience group will see the link)

2. Create a link in your library and set permissions on this link (not recommended, but it works ;)) 

Best, Dave