I would like to import a list of images. the suffix of the images decides which field the image should be imported to. if no file exists, leave the field blank and go to another records. thank you for your advice!

You mean you have a text list that you import first, and then you're going to import an image to a container field based on the text?

yes. i only know to import as folders. i tried to import the list but only string shown

Look at this as a 2 stage process:

1. Import the folder of images into a new table.

2. Parse the the new table based on the GetAsText function to exrtact the file info and pass the image into the real table.