When using the MailBigFile.com service, you will often want to compress a folder of photos or videos.
This will enable you to upload just one large file, rather than sending them all individually.
As is the case with most things on a Mac, it is extremely easy.
All you need to do is right-click, or option-click on a folder and choose the "Compress" option in the menu. Done!
You can do this in both the Finder or the desktop.
It is now simple to upload this .zip file when prompted to choose a file on MailBigFile.com.