Using shared drive from web portal for storage/ sharing

We have a client requirement to open up share "Share drive" path for specific set of users in client's network. I have few questions:-

Opening up a network drive from web portal, Is this approach good enough for document storage/sharing? What are the concerns to share with client before agree to this approach?

Client have limited budget & can't afford a document uploader module.

Any thoughts on this?

Target operating system in Windows.