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If you have complied with the above rules (especially names), then the images are immediately linked to the specified products. Otherwise, you must assign the images to the products later.
Pic 5.1 Image import
Uploaded images are then available in the Pictures folder above the list of items on the left of the screen:
Pic 5.2 List of items - Pictures folder
The upload status of images (3.) can be checked by clicking on the green icon (2.) in the upper right menu after you see confirmation that the images have been successfully imported (1.).