YOU GIVE A GOOGLE DRIVE FILE TO THE PERSON OR THE LINE ART AND THE ADD ON

you see that settings button thing when drawing? click on it, it should show a folder with a red arrow, and a green arrow, soo, if you want to save a drawing, you use the red arrow, if you wanna continue the drawing or smth like that, you have the green arrow, sooo, you can like go to a site called " ufile.io " which can transfer files and when youre done sending the file, you copy the link and give it to another person