You can insert* a file into a Container field as reference only. When you double click the field, it opens the document in its native application. To create a "list", use a Portal to a related table containing the Container field. Some use repetitions instead but processing repetitions is often problematic.
*using a button/script** and not drag & drop
** Insert File [Reference ; your_table::your_field ]
Thank you so much, Jade. The "Reference" checkbox did the trick! I'm still having trouble getting it to insert through a portal, but I think that will just take more studying :-)