Update: July 2021
I deleted the old post as it is no longer relevant. Instead I am re-sharing with you a more recent post:
If you are looking for a free file transfer tool to help you send
large files WeTransfer is a good option to try out. WeTransfer allows
you to send up to 2 GB for free. There are two ways to send in big
files: either through a generated link or through email transfer.
Sending a file through generated link allows you to share a unique
download link with anyone. The second option, that is email transfer,
you need to use your own email and you will have to verify it first
before you can send the file in an email.
To send a big file on WeTransfer head over to the homepage and click on the three dots in the bottom of the 'Add your files' box. Next check 'Send email transfer' or 'Get transfer link'.
If you want more options the pro version is even better. It provides
you with up to 200 GB of transfer in one go and 1 TB of storage. It also
allows you to customize your WeTrasnfer profile, password protect your
files and many more.