We often open artwork without images embedded in the file, unfortunately this leaves the area where the image should be positioned blank. In order to avoid this issue, please follow the below steps.

1. Select the file/image in the Links panel, and choose Embed Image from the panel menu. 

OR

2. Select the linked artwork in the illustration window. In the Control panel, click the Embed button.

Please also keep in mind that when embedding a file, rather than linking to the original, the document size increases. As such, it is best to reduce your file/image sizes before embedding.