Have your read the documentation? https://docs.automation.boschrexroth.com/doc/3570518082/il-tftpputfileasync/1-10/en/
Have you installed a tftp server on you PC? Without a tftp server running on you remote device it is not possible to transfere data via tftp.
My expectation is that you have to provide the drive letter in the target path, when your server is running on a Windows PC.
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