Emerge App allows you to upload multiple images for your products. Please note that this function allows you to upload multiple pictures for one products, not mass upload for all products at once.
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In order to do that you will need to access your products, choose a product that you want to mass upload your images to and click Edit product. 

Once there you will see an option to add images:
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Click on it and then from there you will be able to mass upload your images to the product.

Don’t forget to save once you are done.