Fires when an existing attachment is added to a post for the first time
jetpack_sync_save_attach_attachment
jetpack_sync_save_attach_attachment-
filter jetpack_site_pending_automated_transferFilter if a site is in pending automated transfer state.
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filter jetpack_site_automated_transferFilter if a site is an automated-transfer site.
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filter jetpack_show_backupsWhether UI for backups should be displayed.
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filter jetpack_gutenberg_cdn_cache_busterFilter to modify cache busting for Gutenberg block assets loaded from CDN
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filter jetpack_gutenbergFilter to enable Gutenberg blocks. Defaults to true if (connected or in offline mode) and the Blocks module is active.
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filter jetpack_is_amp_requestReturns true if the current request should return valid AMP content.
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filter jetpack_lazy_images_skip_image_with_atttributesAllow plugins and themes to conditionally skip processing an image via its attributes.
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filter jetpack_lazy_images_blacklisted_classesAllow plugins and themes to tell lazy images to skip an image with a given class.
Jetpack Developer Resources 