Hi @zigzagnico,
Posting here as per our email discussion for other users:
The PDF Embedder Premium does not create any thumbnail images. Your WordPress installation or another plugin is automatically creating a thumbnail image of the PDF document. These are the 3 sizes of image you are seeing associated in the provided screenshot. You can disable this within your Settings > Media—by setting these to 0 (particularly the Medium and Large sizes) you will eliminate the multiple images. You may still wish to keep the real thumbnail sized image enabled or set this to 0 as well.
When you add the attachment page link to the lesson, make sure that you are setting the link as Title and not Thumbnail under the Media dropdown menu.
If you have any other questions, please feel free to send an email to [email protected] as we may not see messages posted here to respond in a timely fashion.
Emma
