I have a local test environment, and when I set up the banners and thumbnails for videos, the video thumbnails are saving with the full URL on my local server. So when I copy the database to a remote development server, the thumnails are broken. 

Is there any way to save them as relative links to the thumbnails? Or is there a workaround to fix them?

I found in the DB a table for called MD slides. In there I saw the bad URLs, but if I change them, it doesn't help.