Vsphere-iso builder : content library permissions

Regarding using the content library upload option in the vsphere-iso builder …

Is there documentation describing the exact permissions Packer requires in order for an account in vSphere in order to upload templates to a vSphere content library?

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    I’m able to get it to work only if I grant full administrative permissions to entire vSphere environment, which is far too much for an account where I want it to have only the required permissions for the content library itself.

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    If I remove permissions to minimize full administrative access, it still works when using PowerCLI, but then Packer does not work.

Thanks in advance!