Within the All Company group on the right hand side there isn't a section called 'PINNED' to add files or links that are important to the group.
However, within groups I create I have the 'PINNED' section.
Am I missing something or is this feature not available/will be available in the All Company Group?
There is a Network Resources section in the All Network group where you can pin files and links. Attached is a screen grab from our All Network group.