I am working a project where want to store files for different departments such as Admin, Finance, IT, HelpDesk etc.
Some files are common across by different departments such as Polices are shared by Admin, Finance and Support cases by IT and HelpDesk departments.
Each department have different access rights.
Used Traditional Site Architecture Tried to created document libraries for each department such as Polices, Support but it creating duplication as polices and support should be placed in one location only and defies the purpose. The departments out-rightly rejected this site structure
Created Hub-Site Architecture.
Created Hub Sites and joined 4 sites. This is much easier for departments and they liked the modern team sites.
How can share common files and document libraries such as Polices and Support as each site has its own and separate Office 365 groups?
Keep it simple. Create a document library at the site level called Policies, give everyone read only access. Embed quick links web part and add frequently visited policies for easy access on each of the department sites. @Aroh Shukla