How to send a document with mail?

Hi, i want to share the downloaded document directly with mail, Goal:- I want to share the document directly with the mail instead of attaching the document manually inside the mail. here i want to elaborate my issue ,Suppose  i have  some documents and beside  every documents it contains a share button and i want to share any of the document through the mail but while i am clicking the share button its redirecting to mail but attachment is not being shared. Kindly help me in this.   Thank you.  
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