Hi @Roger Roger ,
You could use Set-PnPListItemPermission
to set file permissions.
For Example: Adds the 'Contribute' permission to the user 'user@Company portal .com' for listitem with id 1 in the list 'Documents': Set-PnPListItemPermission -List 'Documents' -Identity 1 -User 'user@contoso.com' -AddRole 'Contribute'
For Reference:
Set-PnPListItemPermission
How to share a OneDrive file using powershell?
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