How to send a stream to ftp in Windows?

Question

PowerShell

Tell me how you can encrypt a file and send it to ftp without saving the intermediate result to disk in Powershell?
So far it turned out like this, but it saves the intermediate result, it is necessary that it pours directly to ftp.
Thank you.

$str =  "'C:\Program Files\OpenSSL\bin\openssl.exe' enc -e -aes-256-cbc -a -in '" + $file.Fullname + "' -out '" + $encrDest + $file + ".enc' -k 'key'"
Invoke-Expression "& $str"

Add-Type -Path "C:\Scripts\WinSCPnet.dll"

# Setup session options
$sessionOptions = New-Object WinSCP.SessionOptions -Property @{
    Protocol = [WinSCP.Protocol]::Ftp
    HostName = "7.7.7.7"
    UserName = "user"
    Password = "pass"
}

try
{
    # Connect
    $session = New-Object WinSCP.Session
    $session.Open($sessionOptions)

    # List files
    $remotePath = "/"
    $directoryInfo = $session.ListDirectory($remotePath)

    # Find old files
    $limit = (Get-Date).AddDays(-1)

    $oldFiles =
        $directoryInfo.Files |
        #Where-Object { -Not $_.IsDirectory } | 
        Where-Object { $_.LastWriteTime -lt $limit }
    $oldFiles

    # Delete them
    foreach ($oldFileInfo in $oldFiles)
    {
      if ($oldFileInfo.Name -ne '..') {
      $oldFilePath = $session.EscapeFileMask($remotePath + "/" + $oldFileInfo.Name)
      $session.RemoveFiles($oldFilePath).Check()
    }
    } 

  # Upload files
    $transferOptions = New-Object WinSCP.TransferOptions
    $transferOptions.TransferMode = [WinSCP.TransferMode]::Binary
 
    $transferResult = $session.PutFiles($encrDest, "/", $False, $transferOptions)
 
    # Throw on any error
    $transferResult.Check()
 
    # Print results
    foreach ($transfer in $transferResult.Transfers)
    {
        Write-Host ("Upload of {0} succeeded" -f $transfer.FileName)
    }
    Write-Host "Done"
}
finally
{
    # Disconnect, clean up
    $session.Dispose()
}