This article will walk you through how to turn off media previews that are automatically generated when a photo or video is sent to you on Skype. Note that this tip applies to the desktop version of Skype.
Disable Image & Video Previews on Skype
Open Skype and click on the Tools menu > Options. Then go to IM & SMS > IM Appearance.
Clear the checkbox that reads Show images and other media previews:
To save your settings, click on Save, and exit the Options menu.
From this point forward, when a contact sends you a media file, you will see a blue box similar to the below: