Clients often ask me for simple and, often more importantly, free ways to send data and I have come across a good one recently whilst thumbing the pages of a computer magazine. It is called Send Anywhere and is a file sharing application that takes an easy approach to file sharing and can be used by anyone wanting to share content quickly, from any device, to anyone anywhere in the world. There are plenty of good write-ups of this app online and I have tried it a few times without any problems. It is particularly useful where files are too big to send as email attachments as often there is a limit to the size of attachments.
Details of the app can be found at: https://send-anywhere.com/
You can quickly download and install the software but obviously don't forget to encrypt files still, in the same way you would if sending as an email attachment!