Services like Dropbox let you create a download URL for any files you have.
You can use those links to upload files from DropBox directly to TalentLMS.
There is a catch though. Dropbox passes you through a preview page before letting you download a file. We need to avoid this intermediate step to upload files successfully to TalentLMS.
For the Dropbox specific case, there is a simple transformation on the shared URLs that will do the trick. To bypass the preview page and allow your browser to handle your files, replace www with dl and dropbox with dropboxusercontent in your URL. For example: