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--- title: Troubleshoot virtual machine image uploads in Azure Stack Edge Pro GPU | Microsoft Docs description: Describes how to troubleshoot issues that occur when uploading, downloading, or deleting virtual machine images in Azure Stack Edge Pro GPU. services: databox author: v-dalc ms.service: azure-stack-edge ms.topic: troubleshooting ms.date: 05/13/2021 ms.author: alkohli --- # Troubleshoot virtual machine image uploads in Azure Stack Edge Pro GPU [!INCLUDE [applies-to-GPU-and-pro-r-and-mini-r-skus](../../includes/azure-stack-edge-applies-to-gpu-pro-r-mini-r-sku.md)] This article describes how to troubleshoot issues that occur when downloading and managing virtual machine (VM) images on an Azure Stack Edge Pro GPU device. ## Unable to add VM image to blob container **Error Description:** In the Azure portal, when trying to upload a VM image to a blob container, the **Add** button isn't available, and the image can't be uploaded. The **Add** button isn't available when you don't have the required contributor role permissions to the resource group or subscription for the device. **Suggested solution:** Make sure you have the required contributor permissions to add files to the resource group or storage account. For more information, see [Prerequisites for the Azure Stack Edge resource](azure-stack-edge-deploy-prep.md#prerequisites). ## Invalid blob type for the source blob URI **Error Description:** A VHD stored as a block blob cannot be downloaded. To be downloaded, a VHD must be stored as a page blob. **Suggested solution:** Upload the VHD to the Azure Storage account as a page blob. Then download the blob. For upload instructions, see [Use Storage Explorer for upload](azure-stack-edge-gpu-deploy-virtual-machine-templates.md#use-storage-explorer-for-upload). ## Only blobs formatted as VHDs can be imported **Error Description:** The VHD can't be imported because it doesn't meet formatting requirements. To be imported, a virtual hard disk must be a fixed-size, Generation 1 VHD. **Suggested solutions:** - Follow the steps in [Prepare generalized image from Windows VHD to deploy VMs on Azure Stack Edge Pro GPU](azure-stack-edge-gpu-prepare-windows-vhd-generalized-image.md) to create a fixed-size VHD for a Generation 1 virtual machine from your source VHD or VHDX. - If you prefer to use PowerShell: - You can use [Convert-VHD](/powershell/module/hyper-v/convert-vhd?view=windowsserver2019-ps&preserve-view=true) in the Windows PowerShell module for Hyper-V. You can't use Convert-VHD to convert a VM image from a Generation 2 VM to Generation 1; instead, use the portal procedures in [Prepare generalized image from Windows VHD to deploy VMs on Azure Stack Edge Pro GPU](azure-stack-edge-gpu-prepare-windows-vhd-generalized-image.md). - If you need to find out the current VHD type, use [Get-VHD](/powershell/module/hyper-v/get-vhd?view=windowsserver2019-ps&preserve-view=true). ## The condition specified using HTTP conditional header(s) is not met **Error Description:** If any changes are being made to a VHD when you try to download it from Azure, the download will fail because the VHD in Azure won't match the VHD being downloaded. This error also occurs when a download is attempted before the upload of the VHD to Azure has completed. **Suggested solution:** Wait until the upload of the VHD has completed and no changes are being made to the VHD. Then try downloading the VHD again. ## Next steps * Learn how to [Deploy VMs via the Azure portal](azure-stack-edge-gpu-deploy-virtual-machine-portal.md). * Learn how to [Deploy VMs via Azure PowerShell](azure-stack-edge-gpu-deploy-virtual-machine-powershell.md).