Guess what? You have created a HTML script stored somewhere in SharePoint, and you want to use it somewhere in another Site Collection. But you are stuck with this error, “Cannot retrieve the URL specified in the Content Link property. For more assistance, contact your site administrator”.
There are a few workarounds you can try.
Using Page Viewer or IFRAME
To use the page viewer, the solution is quite straight-forward and can be described in a few sentences.
Firstly, you know that you have created the HTML script, now create a page in the same Site Collection, then add Content Editor Webpart that links to the HTML script.
Then you can go to the other Site Collection, create a page with Page Viewer, or direct HTML with IFRAME which links to the page created in previous step. Remember, the SharePoint top links bar and left navigation will still be displayed. To overcome that, you can add query string “IsDlg=1” at the end of the URL.
If your masterpage is attached with jQuery, you can re-use the following code.
Where "/SiteAssets/common/thescripts.txt" is the URL of your HTML script.