Setting the Library for Links
Open the library

Click the Library Tab (1) then click Library Settings (2)

click Advanced Settings

Tick Yes

click Add from existing site content types

Select Document content types from (1) and Link to a document from (2)

Click Add
Populate the Library


Click New (1) followed by Link to a document (2)

Enter a document Name and a Link (please click “Click here to test” checks if your URL is valid)

Done!
Note that if you do this to Documents Library of a site/subsite and after you create a child subsite, this will not effect the default Documents Library of that child subsite
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