How to set interface auto-connection in snapcraft.yaml

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auto-connection is nothing you can define in snapcraft.yaml it is a privileged operation that needs review and approval:

About the store-requests category

This category is for handling requests for aliases, auto-connections, tracks, and classic confinement. The processes are documented here: Classic confinement review process Process for aliases, auto-connections and tracks Simplified track request process for snaps with predictable cadence Other requests that may need store administrator handling such as snap transfers may also be posted here.

if you own a brand store and create device images, you can override this with connection: entries in your gadget.yaml file for your image though:

Gadget snaps

The gadget snap is responsible for defining and configuring system properties specific to one or more devices. The gadget metadata and content defines: The layout of the volumes that comprise the device storage and image Configuration for the bootloader to use. The gadget also ships the bootloader itself and other boot assets. Default configuration options to use when snaps are installed. Interface connections configured in the connections: section are executed on the device’s first boot only…