diff --git a/src/app/features/project-editor/facade/project-editor.facade.ts b/src/app/features/project-editor/facade/project-editor.facade.ts
index 72d27dc..0e975d7 100644
--- a/src/app/features/project-editor/facade/project-editor.facade.ts
+++ b/src/app/features/project-editor/facade/project-editor.facade.ts
@@ -292,10 +292,18 @@ export class ProjectEditorFacade {
     return current ? this.ioService.exportBootstrap(current) : '';
   }
 
+  /**
+   * Replaces the whole draft with an imported bootstrap. Routed through
+   * updateBootstrap() (not a direct state.update) so an import gets the same
+   * undo-history entry and draftStorage persistence as any other edit -
+   * otherwise the import "worked" on screen but silently wasn't saved to the
+   * localStorage draft, and Undo couldn't step back through it.
+   */
   importBootstrap(raw: string): void {
     try {
       const imported = this.normalize(this.ioService.importBootstrap(raw));
-      this.state.update(current => ({ ...current, bootstrap: imported, importError: null }));
+      this.state.update(current => ({ ...current, importError: null }));
+      this.updateBootstrap(() => imported);
     } catch {
       this.state.update(current => ({ ...current, importError: 'builder.importError' }));
     }