File shared by the sender will be send by either first method or the second one-
Recipients get an email notifying them that the file is shared with them. The email contains the View File button and a link to the shared document. Clicking the link or the button opens the document in a browser. Recipients can also download the document if necessary.
See the example screenshot below showing the email notification received by a recipient-
Related help article- Share and track PDFs online using Adobe Document Cloud