Get data into Power BI Desktop from Sharepoint Server 2013 On-Premises folder

Hello,

Using latest version of Power BI Desktop, and seeking guidance on the correct method for connecting to several excel files located on sharepoint intranet location.  The organization is running sharepoint server 2013 on premises, so the address of the files is something like this: 

http://XYZ-intranet:8080/sites/ABC/DEF/Shared%20Documents/Forms/AllItems.aspx?RootFolder=%2fsites%2fABC%2fDEF%2fShared%20Documents%2f......

I've not had luck with Sharepoint.Files or Web.Contents, including the approaches suggested at the two links below: 

https://community.powerbi.com/t5/Integrations-with-Files-and/SharePoint-On-Premise-Connection-to-Excel-File/td-p/109560

https://community.powerbi.com/t5/Integrations-with-Files-and/Connect-Power-Bi-to-Sharepoint-on-premise-using-Get-Data/m-p/166391#M9839

Any specific recommendations re: method (Sharepoint.Files, Web.Contents, Folder.Files?), which level of the Sharepoint site to connect at, and what account settings to specify?  Can this be done at all? To my knowledge there is no gateway configured yet. Is this a prerequisite, or are gateways moot when using pbi desktop?

Thanks in advance for any guidance!