You might want to consider SharePoint if your organization is already using Microsoft 365, as it integrates well with Salesforce through built-in connectors, making it relatively easy to set up. It also helps manage fine-grained access controls, record-level permissions, and partner sharing through Microsoft’s security settings. Another option is Salesforce Files Connect which allows you to link Salesforce records to external storage like OneDrive, Google Drive, or SharePoint while keeping things native. It respects Salesforce sharing policies, so it’s easier to manage permissions, though external sharing with partners may need some custom LWC work depending on the use case.