Github user YolandaMDavis commented on the issue:
https://github.com/apache/nifi/pull/1957
Ran tests using FileZilla on Windows 10 Server with flow containing GetFTP
-> UpdateAttributes (for filename append) -> PutFTP. Worked as expected with
the below use cases:
Below demonstrates cases where UTF-8 was disabled then enabled

Files were stored as expected on FTP server:

+1 will merge shortly
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at [email protected] or file a JIRA ticket
with INFRA.
---