A PHP snippet for Jetpack: remove External Media from the block editor.
/**
* Remove Jetpack's External Media feature.
*/
add_action(
'enqueue_block_editor_assets',
function () {
$disable_external_media = <<<JS
document.addEventListener( 'DOMContentLoaded', function() {
wp.hooks.removeFilter( 'blocks.registerBlockType', 'external-media/individual-blocks' );
wp.hooks.removeFilter( 'editor.MediaUpload', 'external-media/replace-media-upload' );
} );
JS;
wp_add_inline_script( 'jetpack-blocks-editor', $disable_external_media );
}
);