When product multi selection is set to false then, after selecting a products variant you can’t choose any other variant.
The code for app bridge implementation:
const resourcePickerOptions = {
type: "product",
multiple: false,
action: "add",
};
products = await shopify.resourcePicker(resourcePickerOptions);
Image supporting the statement:
Philosophically speaking, does this not make sense? A product (singular) may have many variants, but since each variant is a product, the selection multiple=false is saying, you get one. If you allow one product, but two or more products, what are you trying to do? Reduce the resource picker to a subset of variants of a single product. So now it is single product, multiple variant. Is that how this Resource (product) picker is designed? Curious. Could perhaps be more expansive?
But I can choose multiple variants if I select using the product itself:
And then if I uncheck one then I can’t check it again which definitely seems like a bug to me:
Based off the docs it should definitely be possible and sounds like a bug
When type is Product, the user may still select multiple variants of a single product, even if multiple is false.
Cool…great discovery Luke, I didn’t see the docs.
Hey folks 
- thanks for raising this here. We’re taking a look into this.
Just a bit of an update - this does look like a possible issue on our end - we’re continuing to investigate. Can’t confirm a turnaround time, but just wanted to keep you folks in the loop.
Thanks for picking up on the issue. It’s been here for a long time. Hope this gets fixed soon.
Comforting to know Shopify is all over the clicks and why they don’t work! Good stuff.
