You cannot have more than one image in a container. It's one file to a field. Perhaps you have a related table with one container field in each related record?
Can I use more then one container ? Just trying to find a way to include 2-3 images in my product catalog database. I am using this database to maintain an commerce site online. So I have to find a way to get more image names to CSV, so I can use it online.
You could, but it would be a much better design to set up a related table of records where you have one container field to each related record, but now have the ability to create and use a fully unlimited number of related records into which you can insert files into container fields.
If you are using "Repetitions" for your "multiple" images (a specified maximum number of repetitions), then you can export them as multiple text. Using the List function; using a calculation field, result Text. Example:
List ( Image_con; Image_con; Image_con; Image_con )
This can be exported as Excel (or comma-separated CSV). Between the above would be the character, "Line Tabulation"; Char (11), Unicode: 000B, UTF8: 0B, HTML:
I imagine your web people can handle that, as it is pretty common (I think); FileMaker and Excel know what it is.