厘度年

When you open your account, there's some icon like this..

their functions :

  Inbox = place to check your inbox

  Starred = where you can find your favorite (starred) email

  Important = where you can find important emails, usually those that has file attached

 Sent mail = where you can find your email that has been sent

 Drafts = your saved email/email that hasn't been sent

And when you compose email..

at the bottom, there's only 4 icon, but, if you click this butto..

 

These icon will be added..

  Send  = to send

  A = to edit the formatting

  to attach files

  insert files using drive

 insert photos

  Insert link

  insert emoticons