win10 sandbox配置至指定位置無效

配置如下

<MappedFolders>

<MappedFolder>

<HostFolder>D:\Downloads </HostFolder>

<ReadOnly> false </ReadOnly>

<SandboxFolder>C:\Users\WDAGUtilityAccount\Pictures </SandboxFolder>

<ReadOnly>false </ReadOnly>

</MappedFolder>

<MappedFolder>

...

</MappedFolder>

</MappedFolders>

開啓后無法看到Downloads内的任意文件

請問該如何指定位置