"Error during upload" - Document Management & SharePoint 2013

Hi, I'm trying to configure AX 2012 so that attached files can be saved to our SharePoint Site. Though whenever I try to attach a file (assigning it the Document Type configured for SharePoint) it throws the very generic Exception:

"Error uploading file"

[Permissions are verfied for the uploading user].

So question is :

a. Did you ever encounter this ?

b. Where can I find LOGs about this error? I tried checking in the Event Viewer over at the AOS, the SharePoint Host, the SQL, AX itself.

Thanks, any help would be so much appreciated.