If you are a services/consulting company and do client work on-site, you often have to sign an agreement from the IT department that prevents you from using a VPN on the client's network. In those cases, your remote workers need web access to files.
We have access either to completely separated guest network, where we have to use VPN to both our network and customer network, or access via Citrix or Remote Desktop, where to exchange the files we have to use the built-in file share facility.
If you are a services/consulting company and do client work on-site, you often have to sign an agreement from the IT department that prevents you from using a VPN on the client's network. In those cases, your remote workers need web access to files.