Location for SSH private key and temporary SFTP download data in Azure functions

I am writing an Azure function that uses WinSCP library to download files using SFTP and upload the files on blob storage. This library doesn't allow to get files as a Stream. Only option is to download them locally. My code also uses a private key file. So i have 2 questions.

1. sessionOptions.SshPrivateKeyPath = Path.GetFullPath("privateKey2.ppk"); is working locally. I have added this file in solution with option "copy to output" and it works. But will it work when Azure function is deployed?
   

2. While getting the files I need to specify local path where the files will be downloaded.

   var transferResult = session.GetFiles(
       file.FullName, Path.GetTempPath() + @"SomeFolder\" + file.Name, false,
       transferOptions); 
   

   The second parameter is the local path.

   What should I use in place of Path.GetTempPath() that will work when Azure function is deployed?