Not sure if this should be filed against snapcraft, launchpad, or some connector tooling. According to the snapcraft documentation it sounds like this should be a valid way to specify the arches: architectures: [amd64, arm64, armhf, i386, ppc64el, riscv64, s390x] However, when uploading this to Launchpad git and then manually triggering a build, only amd64 is built. It builds all the architectures when specified in this manner: architectures: - build-on: amd64 - build-on: arm64 - build-on: armhf - build-on: i386 - build-on: ppc64el - build-on: riscv64 - build-on: s390x The format's fine, it's just that it wasn't obvious or easily discoverable. An error message in a log or on Launchpad somewhere would have helped, or documentation on how to specify multiple arches.