Added new kb article asyncupload-permission-error-troubleshooting (#536)

Co-authored-by: KB Bot <[email protected]>

Author: github-actions[bot]

knowledge-base/asyncupload-permission-error-troubleshooting.md

@@ -0,0 +1,37 @@
+---
+title: Resolving RadAsyncUpload does not have permission to write files in the TemporaryFolder Error
+description: Learn how to solve the error message "RadAsyncUpload does not have permission to write files in the TemporaryFolder" in RadAsyncUpload for ASP.NET AJAX.
+type: troubleshooting
+page_title: RadAsyncUpload Permission Error | Troubleshooting | Telerik
+slug: asyncupload-permission-error-troubleshooting
+tags: asyncupload, permission error, troubleshooting
+res_type: kb
+---
+
+## Environment
+
+| Property | Value |
+|---|---|
+| Product | RadAsyncUpload for ASP.NET AJAX |
+| Version | all |
+
+## Description
+
+I encountered an error message that says "RadAsyncUpload does not have permission to write files in the TemporaryFolder" while using RadAsyncUpload for ASP.NET AJAX. How to solve it?
+
+## Solution
+
+To resolve the "RadAsyncUpload does not have permission to write files in the TemporaryFolder" error, you can try the following solutions:
+
+1. Give write permission to both the Temporary and Target folders. Right-click on the folder, go to Properties, navigate to the Security tab, click on Add, add a new user or select Everyone, and check the "Full Control" checkbox.
+2. Delete the file or folder named 'RadUploadTestFile' from the 'TemporaryFolder' directory.
+3. If you are running Telerik RadAsyncUploader inside an Azure App Service, you need to set the Temporary folder to a shared folder among all used instances. Refer to the following resources for more information:
+   - [Microsoft Azure blog post on sharing folders in Azure](https://learn.microsoft.com/bg-bg/archive/blogs/mariok/sharing-folders-in-azure)
+   - [Telerik forum post on using AsyncUpload with Azure and Blob Service](https://www.telerik.com/forums/any-guidelines-to-use-asyncupload-with-azure-and-blob-service)
+
+## Notes
+
+- Make sure to adjust the folder permissions according to your specific setup and security requirements.
+- Ensure that the Temporary folder is accessible and has the necessary write permissions for the RadAsyncUpload control to function properly.
+  
+