a

[harupy]

sequenceDiagram
    participant C as Client
    participant S as Server
    participant R as Remote Storage

    C->>S: /mpu/create (path, num_chunks)
    opt S3, GCS 
        S->>R: Start MPU (optional)
        R->>S: upload_id (optional)
    end
    Note over S: Generate pre-signed URLs<br/>for uploading chunks
    S->>C: presigned_urls and upload_id

    C->>R: Upload chunks using presigned_urls
    R->>C: Chunks IDs (e.g. ETag for S3)

    C->>S: /mpu/complete (upload_id, chunk_ids)
    S->>R: Complete MPU

    opt If something went wrong
        C->>S: /mpu/abort (path, upload_id)
        S->>R: Abort MPU
    end