Linking an URL containing an excel file error

Hello All - I linked a few excel documents to my Rise 360 course. But I am unable to view/download the document in Rise 360 preview/Review 360/LMS. I get an error. (SS of error attached). 

The URL I am attaching is a dynamic link i.e...,  the documents uploaded there are subject to periodic updates and when learners click that link, they are directed to the most recent/updated version of the document. I tried adding this URL to Storyline 360 and tried as an interactive SL block, and I got 503 error there as well. 

Thanks in advance.