Answer:
When you click the attachment button a window pops up allowing you to select the file/s you want to upload
You can also drag and drop file/s this is an alternative method
Step-by-step explanation:
Microsoft Outlook is a personal information manager software system from Microsoft.
Though primarily an email client, Outlook also includes such functions as calendaring, task managing, contact managing, note-taking, journal logging, and web browsing. Wikipedia