Help with velo package

According to this Velo documentation, I should be able to create a collection and link it to existing store products in order to create a “bundle” functionality.

However, after spending multiple hours following the Setup instructions to a tee, the inventory on the “bundled” product still does not sync properly.

I double-checked all the required CMS fields. I have the latest version of the package installed (1.5).

Any ideas what I’m doing wrong? Or is this package just outdated?