After publishing the plugin to NPM from the GitHub the plugin will not be visible in the Amplication plugin settings/list immediately. This works by adding your plugin to the amplication/plugin-catalog, where the plugin-catalog is indexed by amplication. Adding the new plugin here will add it to the list of plugins in amplication. Any subsequent version that is released to NPM, will be updated automatically - this can take about 5-10 minutes to propagate.
When adding a new plugin to the catalog, two files must be created in this repository. First a icon to represent the plugin should be created under the assets/icons/ folder. Second the metadata for the plugin should be provided under the plugins/ directory.