I have a Gallery shwoing data from SP, with a field that says awaiting delivery. I would like to select the item in the gallery and update the SP list to show Delivered. I know i need to patch the SP list, but unsure on how to do this with Gallery Selected.

So when i Press the button at the top, any gellery item selected will have the Delivered filed altered from Awaiting Delivery to Delivered. This is a YES / NO Choice selection, with Delivered as TRUE.