I have different tiers to select from on my product. The product is a digital download and I have no idea how to send the customer the specific downloadable content that they choose from the tier select. I don't see any way to do this. I know I can connect a product to a download that I've uploaded, but otherwise I don't see any way.
You are right! Currently there is no way to connect the option value to separate digital download. You can only have option to connect the product to download items.