fix link

Author: cloga

articles/machine-learning/prompt-flow/tools-reference/troubleshoot-guidance.md

@@ -45,7 +45,7 @@ To resolve the issue, you have two options:
 
 ## Why can't I upgrade my old flow?
 Prompt flow relies on fileshare to store snapshot of flow. If fileshare has some issue, you may encounter this issue. Here are some workarounds you can try:
-- If you're using private storage account, please see [Why can't I create or upgrade my flow when I disable public network access of storage account?](#why-cant-i-create-or-upgrade-my-flow-when-i-disable-public-network-access-of-storage-account)
+- If you're using private storage account, please see follow [Network isolation in prompt flow](../how-to-secure-prompt-flow.md) to make sure your storage account can be accessed by your workspace.
 - If the storage account is enabled public access, please check whether there are datastore named `workspaceworkingdirectory` in your workspace, it should be fileshare type.
 ![workspaceworkingdirectory](../media/faq/working-directory.png) 
     - If you didn't get this datastore, you need add it in your workspace.