diff --git a/src/app/(protected)/workorders/_components/detail/tabs/slide-over-extras-tab.tsx b/src/app/(protected)/workorders/_components/detail/tabs/slide-over-extras-tab.tsx
index c8728b70..d7bb285c 100644
--- a/src/app/(protected)/workorders/_components/detail/tabs/slide-over-extras-tab.tsx
+++ b/src/app/(protected)/workorders/_components/detail/tabs/slide-over-extras-tab.tsx
@@ -11,6 +11,7 @@ import {
 } from "lucide-react";
 import { toast } from "react-toastify";
 import { Text } from "@/components/ui/text";
+import { workOrdersApi } from "@/domain/work-orders/api/work-orders-api";
 import type { UploadableMediaCategory } from "@/domain/work-orders/mappers/work-order-board-detail-mapper";
 import type { FileCategory, MediaFile } from "@/domain/work-orders/types/work-order-media";
 import {
@@ -43,21 +44,36 @@ type SlideOverExtrasTabProps = {
   isReadOnly: boolean;
   pending?: boolean;
   avetaRequired?: boolean;
+  workOrderId?: string | number;
   onUpload: (files: File[]) => void;
   onRemove: (id: string) => void;
   onCategorize?: (id: string, category: UploadableMediaCategory) => void;
 };
 
+let lastExtraDocObjectUrl: string | null = null;
+
+async function openExtraDocContent(workOrderId: string | number, mediaId: string): Promise<void> {
+  const blob = await workOrdersApi.getMediaContent(workOrderId, mediaId);
+  if (lastExtraDocObjectUrl) {
+    URL.revokeObjectURL(lastExtraDocObjectUrl);
+  }
+  const objectUrl = URL.createObjectURL(blob);
+  lastExtraDocObjectUrl = objectUrl;
+  window.open(objectUrl, "_blank", "noopener,noreferrer");
+}
+
 function ExtraDocRow({
   file,
   isReadOnly,
   pending,
+  workOrderId,
   onRemove,
   onCategorize,
 }: {
   file: MediaFile;
   isReadOnly: boolean;
   pending: boolean;
+  workOrderId?: string | number;
   onRemove: (id: string) => void;
   onCategorize?: (id: string, category: UploadableMediaCategory) => void;
 }) {
@@ -75,15 +91,19 @@ function ExtraDocRow({
         className="shrink-0"
         style={{ color: isAveta ? "var(--warning)" : "var(--color-text-muted)" }}
       />
-      <a
-        href={file.url}
-        target="_blank"
-        rel="noreferrer"
-        className="min-w-0 flex-1 truncate hover:underline"
+      <button
+        type="button"
+        onClick={() => {
+          if (workOrderId == null) return;
+          void openExtraDocContent(workOrderId, file.id).catch(() => {
+            toast.error("Unable to open this document.");
+          });
+        }}
+        className="min-w-0 flex-1 truncate text-left hover:underline"
         style={{ fontSize: 12, color: "var(--foreground)" }}
       >
         {file.name}
-      </a>
+      </button>
       {showCategory ? (
         <select
           aria-label={`Category for ${file.name}`}
@@ -134,6 +154,7 @@ export function SlideOverExtrasTab({
   isReadOnly,
   pending = false,
   avetaRequired = false,
+  workOrderId,
   onUpload,
   onRemove,
   onCategorize,
@@ -238,6 +259,7 @@ export function SlideOverExtrasTab({
               file={file}
               isReadOnly={isReadOnly}
               pending={pending}
+              workOrderId={workOrderId}
               onRemove={onRemove}
               onCategorize={onCategorize}
             />
diff --git a/src/app/(protected)/workorders/_components/detail/work-order-slide-over-tabs.tsx b/src/app/(protected)/workorders/_components/detail/work-order-slide-over-tabs.tsx
index ebd41392..d43d94c1 100644
--- a/src/app/(protected)/workorders/_components/detail/work-order-slide-over-tabs.tsx
+++ b/src/app/(protected)/workorders/_components/detail/work-order-slide-over-tabs.tsx
@@ -147,6 +147,7 @@ export function WorkOrderSlideOverTabs({
         >
           <SlideOverExtrasTab
             uploads={state.extrasUploads}
+            workOrderId={infoSource?.id}
             avetaRequired={resolveSlideOverAvetaRequired(
               state.editing,
               infoSource?.avetaRequired,
diff --git a/src/test/app/(protected)/workorders/slide-over-extras-aveta.test.tsx b/src/test/app/(protected)/workorders/slide-over-extras-aveta.test.tsx
index f4cbaa2b..05f0edd8 100644
--- a/src/test/app/(protected)/workorders/slide-over-extras-aveta.test.tsx
+++ b/src/test/app/(protected)/workorders/slide-over-extras-aveta.test.tsx
@@ -1,6 +1,7 @@
 import { fireEvent, screen } from "@testing-library/react";
-import { describe, expect, it, vi } from "vitest";
+import { afterEach, describe, expect, it, vi } from "vitest";
 import { SlideOverExtrasTab } from "@/app/(protected)/workorders/_components/detail/tabs/slide-over-extras-tab";
+import { workOrdersApi } from "@/domain/work-orders/api/work-orders-api";
 import type { MediaFile } from "@/domain/work-orders/types/work-order-media";
 import { renderWithProviders } from "@/test/test-utils";
 
@@ -21,6 +22,10 @@ const avetaDoc: MediaFile = {
 };
 
 describe("SlideOverExtrasTab Aveta", () => {
+  afterEach(() => {
+    vi.restoreAllMocks();
+    vi.unstubAllGlobals();
+  });
   it("does not label the first extra document as Aveta when none is explicitly Aveta", () => {
     renderWithProviders(
       <SlideOverExtrasTab
@@ -72,6 +77,35 @@ describe("SlideOverExtrasTab Aveta", () => {
     expect(screen.queryByText("safety-form.pdf")).toBeInTheDocument();
   });
 
+  it("opens Extra Docs through authenticated content instead of a static href", async () => {
+    const blob = new Blob(["pdf"], { type: "application/pdf" });
+    const getMediaContent = vi.spyOn(workOrdersApi, "getMediaContent").mockResolvedValue(blob);
+    const createObjectURL = vi.fn(() => "blob:authorized");
+    vi.stubGlobal("URL", { ...URL, createObjectURL, revokeObjectURL: vi.fn() });
+    const open = vi.fn();
+    vi.stubGlobal("open", open);
+
+    renderWithProviders(
+      <SlideOverExtrasTab
+        uploads={[{ ...photo, url: "https://cdn.example.com/Assets/Documents/secret.pdf" }]}
+        workOrderId={10}
+        avetaRequired
+        isReadOnly
+        onUpload={vi.fn()}
+        onRemove={vi.fn()}
+      />,
+    );
+
+    expect(screen.queryByRole("link")).not.toBeInTheDocument();
+    fireEvent.click(screen.getByRole("button", { name: "safety-form.pdf" }));
+
+    await vi.waitFor(() => {
+      expect(getMediaContent).toHaveBeenCalledWith(10, "m1");
+    });
+    expect(createObjectURL).toHaveBeenCalledWith(blob);
+    expect(open).toHaveBeenCalledWith("blob:authorized", "_blank", "noopener,noreferrer");
+  });
+
   it("shows Extra Docs accept copy with PDF DOC and 50MB", () => {
     renderWithProviders(
       <SlideOverExtrasTab uploads={[]} isReadOnly={false} onUpload={vi.fn()} onRemove={vi.fn()} />,