Please make sure to check the save destination drive. Some applications select the C drive as the save destination drive. Also the system administrator may delete them if necessary.
If you create some files or folders in the C drive by mistake, please move or delete them promptly. On Windows Remote Desktop, the C drive must be used only for the system, and users are not permitted to create files or folders in this location. As it compulsorily signs out / logs out even during operation, please keep it in mind. In order to avoid occupation by a small number of users, for Windows desktop and Linux desktop, it automatically signs out / logs out after 2 hours from the time connection started. From Mac OS please use connection on Web browser, Microsoft Remote Desktop, or something.