Drag and Drop problems

Can any one assist please?

I am trying to upload an unzipped file to my blog.

I succeeded in placing this in the public_html folder but I need in in my themes folder so that I can change the theme of my blog and proceed with setting everthing up.

Realizing my mistake I deleted the unzipped folder from the public-html folder and tried to upload the folder from my desktop to the themes folder which is at: public_html/work-from-home/wp-content/themes. But I find I cannot do this using the drag and drop method.

I have studied the video for SmartFTP2.0 and thought I was doing everything right.

Any advice on how to upload this and get myself moving again with my blog would be appreciated.

Many thanks.