Merge pull request #264630 from mikewill4/patch-61

[SFTP] Known limitations update for resumable uploads

Author: prmerger-automator[bot]

articles/storage/blobs/secure-file-transfer-protocol-known-issues.md

@@ -47,8 +47,7 @@ To transfer files to or from Azure Blob Storage via SFTP clients, see the follow
 | Category | Unsupported operations |
 |---|---|
 | ACLs | <li>`chgrp` - change group<li>`chmod` - change permissions/mode<li>`chown` - change owner<li>`put/get -p` - preserving properties such as permissions |
-| Resuming Uploads | `reput`. `put -a` |
-| Random writes and appends | <li>Operations that include both READ and WRITE flags. For example: [SSH.NET create API](https://github.com/sshnet/SSH.NET/blob/develop/src/Renci.SshNet/SftpClient.cs#:~:text=public%20SftpFileStream-,Create,-(string%20path))<li>Operations that include APPEND flag. For example: [SSH.NET append API](https://github.com/sshnet/SSH.NET/blob/develop/src/Renci.SshNet/SftpClient.cs#:~:text=public%20void-,AppendAllLines,-(string%20path%2C%20IEnumerable%3Cstring%3E%20contents)). |
+| Random writes | Operations that include both READ and WRITE flags. For example: [SSH.NET create API](https://github.com/sshnet/SSH.NET/blob/develop/src/Renci.SshNet/SftpClient.cs#:~:text=public%20SftpFileStream-,Create,-(string%20path)) |
 | Links |<li>`symlink` - creating symbolic links<li>`ln` - creating hard links<li>Reading links not supported |
 | Capacity Information | `df` - usage info for filesystem |
 | Extensions | Unsupported extensions include but aren't limited to: [email protected], [email protected], [email protected], [email protected] |
@@ -80,8 +79,10 @@ To learn more, see [SFTP permission model](secure-file-transfer-protocol-support
 ## Other
 
 - For performance issues and considerations, see [SSH File Transfer Protocol (SFTP) performance considerations in Azure Blob storage](secure-file-transfer-protocol-performance.md).
+
+- Resume and append operations require enabling the `SFTP Resumable Uploads` preview feature on your subscription. For more information on enabling preview features, see [Set up preview features in Azure subscription](../../azure-resource-manager/management/preview-features.md).
 
--  By default, the Content-MD5 property of blobs that are uploaded by using SFTP are set to null. Therefore, if you want the Content-MD5 property of those blobs to contain an MD5 hash, your client must calculate that value, and then set the Content-MD5 property of the blob before the uploading the blob.
+- By default, the Content-MD5 property of blobs that are uploaded by using SFTP are set to null. Therefore, if you want the Content-MD5 property of those blobs to contain an MD5 hash, your client must calculate that value, and then set the Content-MD5 property of the blob before the uploading the blob.
 
 - Maximum file upload size via the SFTP endpoint is 100 GB.