How to specify the path of an attachment stored on a different computer in the same network

I'm trying to send an email through SQL Server. The sp_send_dbmail has a parameter to specify the path of a file to send as an attachment. It works perfectly when the file is in the same server where SQL Server is hosted. However, I need to send a file that is stored on another server or computer in the same network. How can I specify the path for such file? Edit: I see no errors in the server agent logs nor dbmail. I ran this query: Select * FROM sys.dm_server_services and gave the account under the service_account column full control of the file in the remote server. This is how I'm calling the sp: EXEC msdb.dbo.sp_send_dbmail @profile_name = 'Profile', @recipients = 'email@email.com', @subject = 'Testing Attachments', @file_attachments = '\\servername\c$\Temp\OutputReport.pdf' Error: Msg 22051, Level 16, State 1, Line 0 Attachment file '\\\servername\c$\Temp\OutputReport.pdf' is invalid.