Connecting to SharePoint Library

Hello All,

I am have issues getting all defined columns from a Sharepoint Library and was wondering if anyone knows the reason behind this PBI behavior. I used the SharePoint Folder connector which defaults to SharePoint.Files which I changed to SharePoint.Contents and got to the library folder that I wanted. But I only see the below columns being and not the others I defined on SharePoint:

1. Content 
2. Name
3. Extension
4. Date Accessed
5. Date Modified
6. Dated Created
7. Attributes (Contains Size, Content Type and Kind)
8. Folder Path

I do not see any other way to retrieve the other columns defined along with their values. Any input would be great!

Thank You