yes you can insert image files into container fields. You can also insert references to your container fields. Why you can't see them in your container field is not a question that can be answered from the info you have provided thus far.
If you insert your images into a table where each record has one container field for a different image, you can use a relationship to your main layout's table to control which, if any image is visible by controlling the match field value in that field that matches to records in your related table.
I you choose, You can create a calculation field in the related image table that returns the file name of the image minus the file extension. You can then set a text field in your layout's table to match to this field with a value list of those file names to select from.