what do I use for app file storage with external partner access

For app file storage with external partner access, the best choice depends on whether you need simple sharing or application-managed storage.

Common options

1. Object storage + controlled sharing

Use something like:

• AWS S3
• Azure Blob Storage
• Google Cloud Storage

Best for:

• App-managed files
• Large files
• External access via pre-signed URLs, expiring links, or partner-specific permissions
• Scalable, durable storage

This is usually the best default if your app handles files and partners only need access to specific files.

2. Shared document platform

Use:

• Microsoft SharePoint / OneDrive
• Google Drive / Workspace

Best for:

• Human collaboration
• Easy partner sharing
• Document workflows and versioning

Less ideal if files are part of a software application backend.

3. Secure file transfer / managed file exchange

Use:

• SFTP
• Azure SFTP
• Managed file exchange platforms

Best for:

• Batch file exchange
• Integration with partner systems
• Compliance-heavy environments

4. Cloud file shares

Use:

• Azure Files
• Amazon EFS
• Google Filestore

Best for:

• Shared filesystem behavior for apps
• Internal app components
• Not usually ideal for direct external partner access

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Recommendation

If this is for an application and external partners need access, I’d usually recommend:

Cloud object storage + signed/expiring access links + role-based permissions

That gives you:

• secure access
• easy scaling
• auditability
• good integration with apps and partner workflows

If you tell me:

1. cloud provider,
2. whether partners are human users or systems,
3. file types/sizes,
4. compliance needs,

I can recommend a more specific setup.