trouble removing .filepart for larger files

Hello – bear with me I am a novice.

Sending sftp .csv files and the other party is reporting that they are unable to integrate the files when .filepart is appended to the files.

I've followed the below directions:

To avoid encountering the ".filepart" issue in WinSCP, you can disable the filepart setting. Follow these steps:

Open WinSCP and navigate to 'Options.'
In the 'Preferences' menu, go to 'Transfer'.
Click on 'Endurance'.
Under 'Enable transfer resume/transfer to temporary filename for', select 'Disable'.
Click 'OK' to save the changes.

However, files over 100KB are still showing with the appended extension. Am I missing a step?

The instructions are correct. Please double check that the settings were saved.

Are you uploading with GUI, right? Aren't you using scripting?