In a SharePoint document library, create a new file, upload your own, and then share it with others.
Create a file
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To create a new file, select New and the file type you want.
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When the new file opens in your browser, add text, images, and more to your file and it'll automatically be saved to the document library.
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Select the site name to see the new file in your document library.
Upload a file
From your computer, select the file you want and then hold down your mouse to drag and drop it into the document library.
Share a file
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Select the file you want to share so a green checkmark
appears. -
Select Share.
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Select an option to share your file:
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Add the emails of people you wish to share your file with. Type in a message, and then select Send.
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Copy Link creates a direct link to the file that you can share in an email or IM.
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Outlook opens up your Outlook app with your file attached to a new email.
Source: Microsoft