When searching for a wine on InVintory, it is not possible to use the UPC barcode on a wine to add it.
We wish that we could support this, but it is very unreliable. Only 50% of wines out there actually come with UPC barcodes and oftentimes retailers will put their own unique barcodes overtop of the producers.
Instead, scan wine labels to find and add bottles to your collection. Pro tip: scanning the back label has an even higher success rate.