Can Square add options to bundles? it’s nice that we now have bundles, however as soon as you add optional colours to the mix and or sizes bundles break down again. I feel this is a pretty important and overlooked feature. Being able to choose sizes, would make the usability of the bundle option way more versatile and usable.
What error are you getting and what are the steps to reproduce? 
There is not an option when creating a bundle via square to add different options such as size colour or alternatives. so when you go add product, then select sell as a bundle you can add individual SKUS/products. but for example, if I sell product A in orange and blue. I only have the option to select product A blue or product A orange. So if i wanted to sell a bundle with a hat, and a shirt. I would have to create a new bundle for every size of shirt we carry instead of being able to select the master product and add the options for sizes
At this time the ability to have multiple options on a bundle isn’t currently available. We’re constantly working to improve our features based on feedback like this, so I’ll be sure to share your request to the API product team.