When there are a large number of images that you need to upload into your CommerceCM store, the FTP image upload process is the best solution.
If you have FTP access to the FTP Folder in the site, then you can use this process for uploading your images. It is wise to use the CSV file for most of the image Categories to help define the proper image name and the Alt Text as well.
Be sure you select the correct Category for where you want your images to be uploaded to, and that your images and CSV file are uploaded into the Images folder, before clicking the Process FTP'D Images.
Below are instructions and a template CSV file.