@treeform I was poking through the source myself and that was my hunch - unable to use the zipfiles lib with the memory buffer. I'm not building any products right now, just picking a few "features" from the docs to experiment with and given recent work requests, put together a little mock project to explore.
Normally I wouldn't bother, but I thought the ZIP only being ~6kb in size made it something worth investigating. Thanks for the help, on to the next project!