Go to settings (gear icon) > select “emails & texts”

Say you need to attach something on your Appointment Confirmation. Just click on “Appointment Confirmation” under email templates as shown below.

Go to your google drive and create the doc you want to attach

If you already have the doc, click on “share”

Select your preferred sharing option. Copy link and then click done

On a calendar view, click on the appointment you wish to send an email. Click Actions > Send Email 

Say you’re going to send a confirmation email, choose the appointment for confirmation template 

On the body of the email, you can type something like “Please click here for more info” to link the doc.  Just highlight the entire phrase

Click on the chain icon 

Paste the link as shown below > “click insert link”

It should look like this afterwards

Then, click Save Changes

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