To make sure your upload is as smooth and secure as possible, we create a zip file when you upload multiple files. Zipping is the process of compressing a bunch of files into a smaller zip file. This will give you the fastest upload possible, and the recipients an equally fast way of downloading the transfer. It doesn't matter what size the files individually are, it's just a fact that when you use our app to upload more than one file at a time a zip file will be created.
If you don't want us to zip the files for you, you can easily zip the files yourself. That way you will be able save the structure of your files and the name remains the same as well. Please have a look here if you need some help creating a zip file or when you need help sending a folder.
And if you or your recipients need some guidance with using the right unzipping tool, please take a look at this tutorial.