When i upload thumbnail from my hard disk i don't see thumbnail, but when I put this same file in media library or i get link to image from other website thumbnail is working.
When I look my uploaded file at the ftp and downloaded to my HDD this image is work corectly, but when I copy link to thumbnail from Download Monitor I have message:
Sorry, we can't find the content you're looking for at this URL. Please try selecting a menu item from above or to the side of this message to get where you'd like to go.
What I make wrong? What I must check?