This option is available in the Document Library Detailed view and on the file preview screen. In the Document Library graphical views click to see the option.
In the Document Library find the file you want to share.
You can only share files, not folders.
A window appears displaying the URL for this file.Tip: The View action lets you preview the file to ensure it is the content you want to share.
Click the icon that represents how you want to share the link.
Note: You can also copy the link and paste it wherever you like, such as an email or document.When you select a sharing option, a page relevant to your selection displays.
Complete the details on the page provided and share the link.
Tip: If an file is a Microsoft Office, PDF, or other text-based file type (not an image or video) then you can also click on the file preview to share a link to the item, and even select to Link to current page.