After many failures, I finally figured it out. Just for anyone else out there trying to import data, UniTrunker does not like the "&" character. Took me forever to finally find that that was my problem.
I took the data that I had in Excel and used a few formulas to force my data into a blank column in the format that UniTrunker wanted. Then saved that file as Delimited Text to keep the format. I then opened that file with Word and used the replace function to delete all of the (return) paragraph entries. Then I opened the unitrunker.xml file using notepad and copied the data from the Word doc and pasted it into the unitrunker.xml file. Saved it and then moved it to the UniTrunker folder.
It was an odd-ball way to do it, but all of the data made it through unscathed. During my copying/pasting, the xml file kept failing to open, so I had to keep pasting small amounts of data until I found the problem with the "&" symbol. Used Word again to replace the "&" with a "/" and all was well.
It would certainly be nice to have an upload feature so folks don't have to use this work-around. I still love UniTrunker. It's an awesome tool. Thank you for making and continuing to support this wonderful resource.