Dropbox JavaScript SDK - ReferenceError: Dropbox is not defined (with angularJS 1.4)

Hi,

I'm trying to use Dropbox Javascript SDK (version 2) in my angular 1.4 Application.

The installation of the package was OK but when I execute the function 'viewFile' I get an error ReferenceError: Dropbox is not defined  in the 2nd line:  var dbx = new Dropbox({ accessToken: ACCESS_TOKEN });

You can see the function:

function viewFile() {
            var SHARED_LINK = "/" + vm.selectedDoc.url;
            var dbx = new Dropbox({ accessToken: ACCESS_TOKEN });
            
            dbx.sharingGetSharedLinkFile({url: SHARED_LINK})
                .then(function(data) {
                    var downloadUrl = URL.createObjectURL(data.fileBlob);
                    var downloadButton = document.createElement('a');
                    downloadButton.setAttribute('href', downloadUrl);
                    downloadButton.setAttribute('download', data.name);
                    downloadButton.setAttribute('class', 'button');
                    downloadButton.innerText = 'Download: ' + data.name;
                    document.getElementById('results').appendChild(downloadButton);
                })
                .catch(function(error) {
                    console.error(error);
            });
            return false;
        }

Keep in mind that I don´t use TypeScript in the App

How Can I solve this error?

Thanks in advance.