GameSave Manager

Does gs_mngr_3.exe have inbound and outbound permissions through your firewall?
It could be as simple as your firewall 'blocking' the data transfer and causing an issue similiar to what I managed to replicate via the List permission.

Have you tried connecting to your FTP host through a dedicated FTP client (such as FileZilla)?
If there's an issue there, it might help you narrow down the issue (it'll likely give you an error code, which your host can use to debug the issue).

That I'm afraid I cannot help with. I performed this test within a Windows 10 virtual machine running FileZilla Server. The permission that I narrowed the issue down to was called List and was under the Directory permission group when configuring the FTP user account within FileZilla Server. No idea...

I've looked into it, but the problem wasn't what I expected. What it looks like is a unmanaged error caused when the provided FTP account details doesn't have List permissions. This permission is required so that GameSave Manager can check if a file with the same filename already exists on the serve...

I have an idea what is causing the issue.
I'll look into it in the coming days, thanks.

Thanks,
Database Update released.

Thanks,
Database Update released.

Thanks,
Database Update released.

This seems to already be in the database, though not separated into individual directories as you have defined here.
Are you requesting for it to be split into such individual directory entries?

I've had to take an educated guess as to what <path-to-game> actually is (I've opted to use ..\steamapps\common\Knights of the Temple - Infernal Crusade\...).