Generate Gmail message

Hey everyone,
I have been working on a website where users can save their files and share it to anyone…They can share their file to someone through 3 ways:
(i)Through my own website using Airtable
(ii)Generating a share link
(iii) Through Email
So I need help for the 3rd way of sharing file(through Gmail)
=> So the user which wants to share the file enters the Email ID to which he wants the file to be send to…So does anybody have idea how I can achieve this? Do ask if you have any questions or doubt regarding the issue… A help would mean a lot…