AZ499438 - Generally Available: Azure Blob Storage SFTP - Resumable Uploads

Azure Updates

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Published

Dec 4, 2025

Status

Launched

Timeline

  • August 2025
    General Availability

Product

Azure Blob Storage
Azure Data Lake Storage

Tag

Features

Category

Storage
Analytics

Description

Announcing the general availability of resumable uploads for Azure Storage Blob SFTP. In the event of a failed partial transfer, this new feature enables users to open the partial file and continue writing the remaining content. This capability optimizes time and conserves network bandwidth, especially in situations where network interruptions occur during file transfers, such as in remote areas with low connectivity or when transferring large files like multimedia or seismic data etc.  

Resume Upload  

The resumable upload feature for Azure Blob Storage SFTP is now generally available. This feature allows users to resume file uploads from the point of failure in the event of partial transfer failures, thereby saving time and reducing network bandwidth usage.  

Learn more. 

The SFTP transfer modes that Azure Blob Storage SFTP supports are below: 

  • Write: This mode lets the client continue an upload by adding data to an existing file from a specific point without creating a new file.  
  • Write + Create: This mode allows the client to resume an upload by either adding to an existing file or creating a new one if it doesn't exist, providing flexibility when the file may not be present initially.  
  • Append: This mode adds data to the end of an existing file without overwriting its current contents.  

Resumable upload enhances efficiency by saving time and bandwidth during interrupted file transfers. Please reach out to [email protected] for feedback about SFTP for Azure Blob Storage.