updating auth support table

Author: khdownie

articles/storage/common/authorize-data-access.md

@@ -25,7 +25,7 @@ The following table describes the options that Azure Storage offers for authoriz
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 | Azure Blobs | [Supported](/rest/api/storageservices/authorize-with-shared-key/) | [Supported](storage-sas-overview.md) | [Supported](../blobs/authorize-access-azure-active-directory.md) | Not supported | [Supported but not recommended](../blobs/anonymous-read-access-overview.md) | [Supported, only for SFTP](../blobs/secure-file-transfer-protocol-support-how-to.md) |
 | Azure Files (SMB) | [Supported](/rest/api/storageservices/authorize-with-shared-key/) | Not supported | [Supported, only with Azure AD Domain Services](../files/storage-files-active-directory-overview.md) | [Supported, credentials must be synced to Azure AD](../files/storage-files-active-directory-overview.md) | Not supported | Not supported |
-| Azure Files (REST) | [Supported](/rest/api/storageservices/authorize-with-shared-key/) | [Supported](storage-sas-overview.md) | Not supported | Not supported | Not supported | Not supported |
+| Azure Files (REST) | [Supported](/rest/api/storageservices/authorize-with-shared-key/) | [Supported](storage-sas-overview.md) | [Supported (preview)](../files/authorize-oauth-rest.md) | Not supported | Not supported | Not supported |
 | Azure Queues | [Supported](/rest/api/storageservices/authorize-with-shared-key/) | [Supported](storage-sas-overview.md) | [Supported](../queues/authorize-access-azure-active-directory.md) | Not Supported | Not supported | Not supported |
 | Azure Tables | [Supported](/rest/api/storageservices/authorize-with-shared-key/) | [Supported](storage-sas-overview.md) | [Supported](../tables/authorize-access-azure-active-directory.md) | Not supported | Not supported | Not supported |