Andreas,

 

The Stock Code Image Import function is designed to maintain a single image for a large number of stock codes.  To add multiple images to a stock code, you must edit the stock code and from the Images tab, click Add, then select all the images you want to add.

 

PS  If you are needing to add multiple images to many stock codes, import each image into a unique stock code, then using the Batch Rename/Merge/Delete function, load a list that merges the newly added stock codes into the one you want to remain.