Uploading Files To Host Question

I'm new at this but learning. Hopefully this is the correct venue for this question. I'm sure there's a very simple solution that people are using all the time.

I'm trying to upload a couple of pages to my hosting account where I have my WP site.

One is a Landing page and the other is a Download page. For the Landing page, I'm told to upload all .html files plus the folders for .css, .stylecss and Images. I've done this and no problem.

But when I want to upload the Download page, my ftp client wants to know if I want to overwrite the original set of .css, .stylecss and Images folders. I'm sure if i do that, then the original Landing page will not load up properly.

How is this normally handled? Do I change the name of the files?

Thanks for any help.

Rainer