diff --git a/docs/guides/beta-test-plans.md b/docs/guides/beta-test-plans.md
index f978931..d567656 100644
--- a/docs/guides/beta-test-plans.md
+++ b/docs/guides/beta-test-plans.md
@@ -12,6 +12,10 @@ file applies to all participants. Every file needs at least one matching test
 participant. For example, a T5 script and a T6 script can share one beta without
 either script being installed on the other game's servers.
 
+Choose **Add all eligible files** to add the latest unpromoted version of every
+remaining eligible file at once. Files and exact versions you already selected
+stay unchanged.
+
 Setup defaults to automatic selection. Enter one **Instances per game** number,
 which defaults to 1 and applies to every game represented by the selected files
 and their matching servers. Every automatically selected instance must pass
diff --git a/src/routes/betas/new/+page.svelte b/src/routes/betas/new/+page.svelte
index afade2c..22524ff 100644
--- a/src/routes/betas/new/+page.svelte
+++ b/src/routes/betas/new/+page.svelte
@@ -84,6 +84,7 @@
         allowLeave = false;
     let hasLinkedSetup = $state(false);
     let loadingVersions = $state<Set<number>>(new Set());
+    let addingAllFiles = $state(false);
     const rowRequests = new Map<number, number>();
     let versionRequest = 0;
     let betaLabel = $state('');
@@ -103,6 +104,9 @@
                     picks.some((pick) => pick.scriptId === file.id && versionsFor(pick).length > 0))
         )
     );
+    const remainingFiles = $derived(
+        eligibleFiles.filter((file) => !picks.some((pick) => pick.scriptId === file.id))
+    );
     const filesReady = $derived(
         picks.length > 0 &&
             picks.every(
@@ -526,6 +530,22 @@
                 loadingVersions = new Set([...loadingVersions].filter((key) => key !== pick.key));
         }
     }
+    async function addAllFiles() {
+        if (addingAllFiles || loadingVersions.size || !remainingFiles.length) return;
+        const selected = picks.filter((pick) => pick.scriptId !== null);
+        const additions = remainingFiles.map((file) => ({
+            key: nextKey++,
+            scriptId: file.id,
+            versionId: null
+        }));
+        picks = [...selected, ...additions];
+        addingAllFiles = true;
+        try {
+            await Promise.all(additions.map((_, index) => onPickFile(selected.length + index)));
+        } finally {
+            addingAllFiles = false;
+        }
+    }
     function toggleServer(name: string) {
         const next = new Set(pickedServers);
         if (next.has(name)) next.delete(name);
@@ -749,11 +769,21 @@
                                     </p>{/if}{/if}
                         </section>{/each}
                 </div>
-                <Button
-                    onclick={() =>
-                        (picks = [...picks, { key: nextKey++, scriptId: null, versionId: null }])}
-                    disabled={picks.length >= eligibleFiles.length}>Add file</Button
-                >
+                <div class="actions">
+                    <Button
+                        onclick={() =>
+                            (picks = [
+                                ...picks,
+                                { key: nextKey++, scriptId: null, versionId: null }
+                            ])}
+                        disabled={picks.length >= eligibleFiles.length}>Add file</Button
+                    >
+                    <Button
+                        onclick={addAllFiles}
+                        disabled={!remainingFiles.length || loadingVersions.size > 0}
+                        loading={addingAllFiles}>Add all eligible files</Button
+                    >
+                </div>
                 <p class="muted">
                     Combine files for different games in one beta. Each file installs only on
                     servers matching its scope, and every file needs at least one test participant.
diff --git a/tests/client/beta-setup.test.ts b/tests/client/beta-setup.test.ts
new file mode 100644
index 0000000..780001e
--- /dev/null
+++ b/tests/client/beta-setup.test.ts
@@ -0,0 +1,163 @@
+import { afterEach, beforeEach, expect, it, vi } from 'vitest';
+import { flushSync, mount, unmount } from 'svelte';
+import { writable } from 'svelte/store';
+import BetaSetupPage from '../../src/routes/betas/new/+page.svelte';
+
+const currentPage = writable({
+    url: new URL('http://localhost/betas/new'),
+    data: { user: { role: 'operator' } }
+});
+vi.mock('$app/stores', () => ({
+    page: {
+        subscribe: (run: Parameters<typeof currentPage.subscribe>[0]) => currentPage.subscribe(run)
+    }
+}));
+vi.mock('$app/navigation', () => ({ goto: vi.fn(), beforeNavigate: vi.fn() }));
+vi.mock('../../src/lib/ui/stores/fleet.js', () => ({
+    fleetServers: writable([]),
+    fleetError: writable(''),
+    refreshFleet: vi.fn().mockResolvedValue(undefined)
+}));
+
+let component: ReturnType<typeof mount> | undefined;
+beforeEach(() => {
+    const storage = new Map<string, string>();
+    vi.stubGlobal('localStorage', {
+        getItem: (key: string) => storage.get(key) ?? null,
+        setItem: (key: string, value: string) => storage.set(key, value),
+        removeItem: (key: string) => storage.delete(key)
+    });
+    window.history.replaceState({}, '', '/betas/new');
+});
+afterEach(async () => {
+    if (component) await unmount(component);
+    component = undefined;
+    document.body.replaceChildren();
+    vi.unstubAllGlobals();
+});
+
+function file(
+    id: number,
+    options: {
+        currentVersionId?: number;
+        latestVersionId?: number | null;
+        runningBetaId?: number;
+    } = {}
+) {
+    const latestVersionId =
+        options.latestVersionId === undefined ? id * 10 + 2 : options.latestVersionId;
+    return {
+        id,
+        name: `File ${id}`,
+        kind: 'script',
+        target_rel_path: `file-${id}.gsc`,
+        scope_type: null,
+        scope_value: null,
+        current_version_id: options.currentVersionId ?? id * 10,
+        latestVersion: latestVersionId === null ? null : { id: latestVersionId },
+        runningBetaId: options.runningBetaId ?? null
+    };
+}
+const files = [
+    file(1),
+    file(2),
+    file(3, { currentVersionId: 32 }),
+    file(4, { runningBetaId: 7 }),
+    file(5, { latestVersionId: null })
+];
+const button = (label: string) =>
+    [...document.querySelectorAll('button')].find((node) => node.textContent?.trim() === label)!;
+const selections = () =>
+    [...document.querySelectorAll('.pick-row')].map((row) =>
+        [...row.querySelectorAll('select')].map((select) => select.value)
+    );
+
+async function show({ query = '', failingFile = 0 } = {}) {
+    window.history.replaceState({}, '', `/betas/new${query}`);
+    currentPage.set({
+        url: new URL(window.location.href),
+        data: { user: { role: 'operator' } }
+    });
+    const fetch = vi.fn(async (url: string) => {
+        if (url === '/api/scripts') return Response.json({ scripts: files });
+        const script = files.find((entry) => url === `/api/scripts/${entry.id}`);
+        if (!script) throw new Error(`Unexpected request: ${url}`);
+        if (script.id === failingFile) return new Response('', { status: 503 });
+        return Response.json({
+            script,
+            versions: [2, 1, 0].map((version) => ({
+                id: script.id * 10 + version,
+                version: version + 1,
+                release_version: `1.0.${version}`,
+                sha256: `hash-${script.id}-${version}`,
+                state: 'untested'
+            })),
+            matchedServers: []
+        });
+    });
+    vi.stubGlobal('fetch', fetch);
+    component = mount(BetaSetupPage, { target: document.body });
+    flushSync();
+    await vi.waitFor(() => {
+        flushSync();
+        expect(button('Add all eligible files')).toBeDefined();
+    });
+    return fetch;
+}
+
+it('adds every eligible file with its latest unpromoted version and replaces empty rows', async () => {
+    const fetch = await show();
+    button('Add file').click();
+    flushSync();
+    expect(document.querySelectorAll('.pick-row')).toHaveLength(2);
+    button('Add all eligible files').click();
+    await vi.waitFor(() => {
+        flushSync();
+        expect(selections()).toEqual([
+            ['1', '12'],
+            ['2', '22']
+        ]);
+    });
+    expect(button('Continue').disabled).toBe(false);
+    expect(button('Add all eligible files').disabled).toBe(true);
+    button('Add all eligible files').click();
+    flushSync();
+    expect(document.querySelectorAll('.pick-row')).toHaveLength(2);
+    expect(fetch.mock.calls.map(([url]) => url)).toEqual([
+        '/api/scripts',
+        '/api/scripts/1',
+        '/api/scripts/2'
+    ]);
+});
+
+it('preserves exact linked versions, including an older upload of a promoted file', async () => {
+    await show({ query: '?artifact=1:11&artifact=3:31' });
+    button('Add file').click();
+    flushSync();
+    button('Add all eligible files').click();
+    await vi.waitFor(() => {
+        flushSync();
+        expect(selections()).toEqual([
+            ['1', '11'],
+            ['3', '31'],
+            ['2', '22']
+        ]);
+    });
+    expect(button('Continue').disabled).toBe(false);
+});
+
+it('retains successful selections and blocks continuing when one file cannot load versions', async () => {
+    await show({ failingFile: 2 });
+    button('Add all eligible files').click();
+    await vi.waitFor(() => {
+        flushSync();
+        expect(document.querySelector('[role="alert"]')?.textContent).toContain(
+            'Could not load versions'
+        );
+    });
+    expect(selections()[0]).toEqual(['1', '12']);
+    expect(selections()[1][0]).toBe('2');
+    const failedVersion = document.querySelectorAll('.pick-row')[1].querySelectorAll('select')[1];
+    expect(failedVersion.selectedOptions[0].textContent).toBe('Choose a version');
+    expect(button('Continue').disabled).toBe(true);
+});