Add .kwgt showing 0 as size in kapk

I'm trying out the KAPK app for the first time, but my intention is to take a collection of my favorite widgets from different packs and compile them into one apk, for personal use only. When I select the kwgt files to add, it loads a kwgt that has no picture and shows a size of zero, and I checked to be sure my collection isn't showing that as the size, to be sure, and it's not. What am I doing wrong?