I need to grant my client access to a folder buried deep on the server

I need to grant my client access to a folder buried deep on the server hosting their site…and just one particular folder. I don't want them to mess with any other files on the server.

Essentially I need them to be able to download an image from that folder.

I’m trying not to overcomplicate things for my client. I’m afraid I might scare the client by suggesting they use an FTP manager like FileZilla. (It might not be intimidating to us but it might intimidate my client).

Does anyone have any suggestion as to how I could handle this?

Thanks in advance for your answer.

is it just to download, or do they need access to upload?

if it's just to download I'd just create the folder drop the image and give them the address of the folder.