It is also advisable to use a port number as shown in the example above. If you are performing some other action with the zip and/or these solutions don’t help you, please send me your graph (without passwords) and full log containing the error, preferably at debug level. Also, please describe what exactly you want to do with the zip.
Thank you for the screenshot, however could you please send me the graph file itself (*.grf)? Also, please try to add the port number to the URL, so we can disprove it as the reason of this issue. But please, make sure you are using the correct port number.
This resembles a known Synology server issue. Can you confirm that you are using some Synology FTP solution? If so, then I can assure you it will be fixed in one of our future updates. If this is not your case, please let me know.