Problems with Copy and Paste

Hi
I'm new here and new to Windows 10, which installed itself onto my computer just recently. I have some folders I like to backup to Dropbox and in Windows 7 I would simply copy the folder and then past into the Dropbox window and I would get an option, amongst other things, to replace the existing folder - which is what I would choose to do do.

I tried doing the same in Windows 10 and I'm not getting the option to replace the existing folder. Nothing at all pop sup and it is automatically making a new folder of the same name, but with the word 'copy' added. So I end up with the original folder plus the new copy folder. I really want to overwrite the existing folder and everything that is in it, like I used to, and not make another copy of everthing I backup there.

Am I missing something simple somewhere that I should be doing to get the message to pop up asking if I want to replace the existing folder?

Thanks for any help

Well...that's really weird. Just went and tried it again, no restart or anything, and suddenly it's working how it should