Uploads and Storage

Uploads and storage turn a file sent by a browser or client into a database file record plus an object in a storage driver. This area is highly affected by reverse proxies, CORS, object storage, and follower-node topology.

Capability Boundaries

Capability	Notes	Related docs
Direct small-file upload	Browser posts to primary; server writes to the target storage	Uploads and Large Files
Chunked upload	Local chunk sessions, progress, resume, 24h session TTL	Uploads and Large Files
Object-storage presigned upload	Browser PUTs directly to S3-compatible storage, Azure Blob SAS URLs, or Tencent COS; server verifies and finalizes	Uploads and Large Files, Storage Policies
Object-storage multipart	Browser uploads parts in batches; server completes and validates content	Uploads and Large Files, S3 / MinIO / R2, Azure Blob Storage, Tencent COS
Microsoft Graph storage	Writes files to OneDrive, SharePoint site drives, or Microsoft 365 group drives after administrator authorization	OneDrive, Storage Policies
SFTP storage	Server-side streaming reads and writes to an SSH/SFTP file server	SFTP, Storage Policies
Storage policies	Decide whether files land on local, s3, sftp, azure_blob, tencent_cos, one_drive, or remote	Storage Policies
Policy groups	Route by user, team, and file size to storage policies	Storage Policies
Follower storage	Primary writes objects to a follower; the follower stores them locally or in S3	Follower Node Enrollment, Follower Node Storage Policy

Backend Modules

Module	Owns
files::upload	Upload sessions, chunks, progress, status transitions
workspace::storage_core	Blob dedupe, file records, quota, policy choice, finalization
storage_policy::policy	Storage policies, policy groups, rules
storage::traits, storage::drivers, storage::connectors	StorageDriver and StorageConnector abstractions, local, S3-compatible, SFTP, Azure Blob, Tencent COS, OneDrive, and remote drivers
storage::remote_protocol	Primary/follower internal remote storage protocol
remote::remote_node, remote::storage_target	Follower nodes and remote storage targets
task::storage_migration	Storage migration tasks

Key Boundaries

• Quota checks have two layers: fast-fail outside the transaction and authoritative checking inside the transaction.
• Filename uniqueness, blob ref counts, and upload-session state transitions must use repository-level atomic helpers.
• Whether presigned works depends on browser reachability to object storage or follower base_url, not only primary reachability.
• A successful admin connection test only proves that the AsterDrive server can reach the backend. presigned upload / download still needs browser network and CORS checks for object storage, Azure Blob, or follower endpoints.
• SFTP is a server-side streaming backend. Its operational checks are Endpoint, SSH credentials, base path, and host key fingerprint; browser CORS and presigned URLs are not involved.
• Follower reverse_tunnel is suitable for relay_stream, not browser-direct presigned.

Troubleshooting Direction

• Small files upload but large files fail: check reverse proxy body size, timeout, temporary directories, and chunk size.
• relay_stream works but presigned fails: check CORS, browser network, and endpoint reachability.
• Connection test fails: read the backend diagnostic first. Storage diagnostics are returned in the standard error response as error.diagnostic.message.
• Follower storage fails: check node enabled state, transport mode, the remote storage target bound to the policy, the default target, and protocol capabilities.
• Quota or blob references drift: run a deep check with Operations CLI.