There are two methods for uploading a zip file to Resources: drag-and-drop and the upload file functionality. Once you have uploaded the file, you may use the Actions / Expand Zip Archive functionality to unpack the zip file into its component files.
Select the Resources tool from the Tool Menu of your site.
Drag the zip file from your computer and drop it in the box marked Drop files here to upload.
This will display a thumbnail of the zip file that will be uploaded.
If you prefer to browse for your file instead, click the Drop files here to upload, or click here to browse button to go to the file browser view.
Locate and select the file on your computer, then click Open to upload.
From the Actions drop-down menu next to the zip file, select Expand ZIP Archive.