Cannot close remote file error I am unable to resolve

I am having an issue with uploading files to a directory on the Server using Winscp. When I try to FTP the "Data.xlsx" file or the SA.sas file in the attached image, I get the Error "Cannot close remote file 'Data.xlsx'". I used Task Manager to ensure no applications associated with Excel are running so I am not too sure how to solve this issue.

As I've asked you on your duplicate question on Super User (which you have deleted meanwhile):
We need a log file.