$storSas = "sas-generated-with-windows-storage-explorer"
$StorageAccountName = "storageacc"
$containerName = "some-cont-name"
$clientContext = New-AzureStorageContext -SasToken $storSAS -StorageAccountName $StorageAccountName

# upload a file
Set-AzureStorageBlobContent -File "F:somefile" `
  -Container $containerName `
  -Blob "somefile" `
  -Context $ClientContext