An image-folder is used as a place to store image-files, that are or shall be inserted in the content of the product documentation.
Note: You cannot physically "store" an image at the position within the content where the image shall appear. Rather you always have to first upload an image to an image-folder and then insert it into the content via inline- or structural-inclusion at the position where the image shall appear.
Another feature of image-folders is, that a thumbnail gallery preview of the contained images will be shown in the preview area when you select the image-folder (see screenshot below).
Figure 2.3.10. Image gallery
You can rename an image-folder by selecting "Edit properties" from the context menu or by double-clicking the folder.
See Section 220.127.116.11, “File upload and download” on how to upload/download files to/from an image-folder.