Follow the below steps for inserting google drive document in your confluence article :

• Initially enable google drive in your confluence profile. To do so click on Profile tab and follow the below process.

OR

Click on Authorize with Google Drive button

•  After enabling google drive.
• Go to the article where the Google Drive document needs to be inserted and click on Edit option.  Click on + button for selecting the Macro menu and select google document

• choose the particular document by clicking on " Select Document" option

• Type the document name and click on search

• After that it will display all the documents from your google drive related to the name which you have provided. Select the particular documents that needs to be uploaded.

• You can preview the page and change the width or height if necessary