Web.Contents doesn't allow to save a file

Hi

I have a report with Google Sheets as a source. I found here that if I use Source = Web.Contents instead of Web.BrowserContents I won't need a gateway to refresh the report. 

I changed the function but now I can't save the report, it says that the report file is opened somewhere else.

Here's my code:

Source = Web.Contents("https://docs.google.com/spreadsheets/d/e/2.....SQ/pubhtml?gid=108173371&single=true")

What could it be? 

Thank you!