If you’re using Outlook on Office.com, you can add any file from your Google Drive or OneDrive by doing the following

1. Login to your Microsoft Office account by going to https://office.com
2. Click on the icon for Outlook
   
3. Once in Outlook create a new email by clicking on the "New message" button
   
4. In the new message, window click on the "down-pointing arrow" next to the word "Attach" so that the menu below appears and select "Browse cloud locations"
   
5. A new window will appear that looks like the one below:
   • If you wish to attach a file from your Microsoft OneDrive click on "Files" on the left-side menu and locate the file you wish to attach
   • If you wish to attach a file from your Google Drive, and it is not listed on the left-side menu, click on the "Add an account" and then choose the Google Drive icon on the right-side
     • When prompted enter your Google login information
     • When prompted again click "Allow" so that Microsoft is allowed to access your Google Drive
     • Once you have done this Google Drive will appear on the left-side menu as an option to choose
       
     • Once Google Drive is an available option you can browse your Google Drive and locate the file Or files you wish to attach to the email
   • In either case, you can select one or more files simply by clicking on the file name.  A check box will appear next to each file you are selecting to attach
6. Once you have selected your file (or files) to attach to the email the "Next" button at the bottom of the window will become active and you can click on it to proceed.
   
7. When you click on "Next":
   • When attaching a file from OneDrive you will be prompted in the following way
     • Here you have the option to attach a copy of the file physically or you can share a link to the file from your OneDrive
   • When attaching a file from Google Drive you will be prompted in the following way
     • Unfortunately, Google files ONLY exist in the "Cloud" so you cannot attach a physical copy of the file, you can ONLY share a link to the file
8. Once you have selected your options the file will be attached to your new email and you can proceed as normal in giving the email recipients, a subject line and message content