I'm attempting to add sound files to the archive with the "Create Archive" button. I click and drag the files into the box and click pack files, but when i check the archive the files are not there. Are there any programs i can use to add the files to the .BSA directly? or a way to make the construction kit do what it says it is going to do?

The Create Archive button is bugged.
Does it work if you use "Upload to Steam", and then cancel when it asks you to input the info?

it appears that it does not