Unzipping

I am hoping to use zoho as a teaching environment and part of my idea involves uploading three folders with several levels of folders and around 0.5g of files.

I have tried uploading a zipped version of one of the folders but it won't unzip. I did the same with a single file and it is still in my workspace zipped even though I have used the zip facility. Can anyone advise me how to solve this?

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