How to Add Attachments in Gmail
You can send someone a file as an attachment that they'll receive with your email. You can attach files from your computer, or from your Google Drive.
A file browser dialog box opens, where you can browse for and select files to attach.
The file is attached to the email. You can continue to edit the email until you’re ready to send it.
The email is sent, with the file attached.
You can also attach a file directly from your Google Drive. This will allow you the choice to include the file as a regular attachment, or as a link to the file in your Google Drive.
A Google Drive file browser window opens.
Linking to a file in your Google Drive instead of attaching it will keep the size of the email itself smaller, while also allowing you to update the linked file after sending the email.
The email is sent, with the Google Drive file either linked to or attached.Attach a File from Google Drive