You have to open a new session to a different server using
Or have one parametrized script that you call multiple times (in a sequence or in parallel, as you like).
See https://winscp.net/eng/docs/script_upload_multiple_servers
open
before each synchronize
command.
Or have one parametrized script that you call multiple times (in a sequence or in parallel, as you like).
See https://winscp.net/eng/docs/script_upload_multiple_servers