diff --git a/app/Services/Social/AbstractLinkedInPublisher.php b/app/Services/Social/AbstractLinkedInPublisher.php
index 8fc052cc..16c8f7d2 100644
--- a/app/Services/Social/AbstractLinkedInPublisher.php
+++ b/app/Services/Social/AbstractLinkedInPublisher.php
@@ -370,6 +370,9 @@ private function doUploadVideo(string $tempFile, $mediaItem): ?string
                 if ($etag) {
                     $uploadedPartIds[] = $etag;
                 }
+
+                unset($chunkData, $chunkResponse);
+                $this->freeChunkMemory();
             }
         } finally {
             fclose($handle);
diff --git a/app/Services/Social/Concerns/HasSocialHttpClient.php b/app/Services/Social/Concerns/HasSocialHttpClient.php
index 092ca717..a465b97a 100644
--- a/app/Services/Social/Concerns/HasSocialHttpClient.php
+++ b/app/Services/Social/Concerns/HasSocialHttpClient.php
@@ -32,7 +32,7 @@ protected function socialHttp(): PendingRequest
         return Http::retry(
             times: 3,
             sleepMilliseconds: 5000,
-            when: fn ($exception, $request) => $exception->response?->status() === 429,
+            when: fn ($exception, $request) => ($exception->response ?? null)?->status() === 429,
             throw: false,
         )->timeout(120);
     }
@@ -41,4 +41,16 @@ protected function redactResponseBody(string $body): string
     {
         return TokenRedactor::redact($body);
     }
+
+    /**
+     * Reclaim memory between chunks of a streaming upload. Each request's body
+     * and the HTTP client's request/response objects are held alive by reference
+     * cycles the PHP runtime only frees when the cycle collector runs, so a
+     * long chunked upload accumulates the whole file in memory without this.
+     * Callers must `unset()` the chunk and response first.
+     */
+    protected function freeChunkMemory(): void
+    {
+        gc_collect_cycles();
+    }
 }
diff --git a/app/Services/Social/XPublisher.php b/app/Services/Social/XPublisher.php
index ee925fde..f7be5127 100644
--- a/app/Services/Social/XPublisher.php
+++ b/app/Services/Social/XPublisher.php
@@ -236,6 +236,9 @@ private function chunkedUpload(string $tempFile, int $totalBytes, string $mimeTy
                 }
 
                 $index++;
+
+                unset($chunk, $appendResponse);
+                $this->freeChunkMemory();
             }
         } finally {
             fclose($handle);
diff --git a/tests/Feature/Services/Social/LinkedInPublisherTest.php b/tests/Feature/Services/Social/LinkedInPublisherTest.php
index f0fe2a3f..94b837cc 100644
--- a/tests/Feature/Services/Social/LinkedInPublisherTest.php
+++ b/tests/Feature/Services/Social/LinkedInPublisherTest.php
@@ -431,6 +431,75 @@
     Http::assertSent(fn ($request) => str_contains($request->url(), '/rest/posts'));
 });
 
+test('linkedin publisher uploads a video across multiple chunks', function () {
+    $this->post->update([
+        'media' => [
+            [
+                'id' => 'test-media-video',
+                'path' => 'media/2026-01/test-video.mp4',
+                'url' => 'https://example.com/media/2026-01/test-video.mp4',
+                'mime_type' => 'video/mp4',
+                'original_filename' => 'test-video.mp4',
+            ],
+        ],
+    ]);
+
+    $chunkBase = 'https://www.linkedin.com/dms/upload/v2/chunk/video/';
+    $chunkPuts = 0;
+
+    Http::fake(function ($request) use ($chunkBase, &$chunkPuts) {
+        $url = $request->url();
+
+        if (str_contains($url, 'initializeUpload') && str_contains($url, '/rest/videos')) {
+            return Http::response([
+                'value' => [
+                    'video' => 'urn:li:video:FakeVideoUrn',
+                    'uploadToken' => 'upload-token-abc',
+                    'uploadInstructions' => [
+                        ['uploadUrl' => $chunkBase.'0', 'firstByte' => 0, 'lastByte' => 1023],
+                        ['uploadUrl' => $chunkBase.'1', 'firstByte' => 1024, 'lastByte' => 2047],
+                        ['uploadUrl' => $chunkBase.'2', 'firstByte' => 2048, 'lastByte' => 3071],
+                    ],
+                ],
+            ], 200);
+        }
+
+        if (str_starts_with($url, $chunkBase)) {
+            $chunkPuts++;
+
+            return Http::response(null, 200, ['etag' => '"etag-'.$chunkPuts.'"']);
+        }
+
+        if (str_contains($url, 'finalizeUpload') && str_contains($url, '/rest/videos')) {
+            return Http::response(null, 200);
+        }
+
+        if (str_contains($url, '/rest/videos/')) {
+            return Http::response(['status' => 'AVAILABLE'], 200);
+        }
+
+        if (str_contains($url, '/rest/posts')) {
+            return Http::response(null, 201, ['x-restli-id' => 'urn:li:share:multichunk']);
+        }
+
+        return Http::response(str_repeat('x', 4096), 200);
+    });
+
+    $result = $this->publisher->publish($this->postPlatform);
+
+    expect($result['id'])->toBe('urn:li:share:multichunk');
+    expect($chunkPuts)->toBe(3);
+
+    // All three chunk etags are collected and sent to finalize.
+    Http::assertSent(function ($request) {
+        if (! str_contains($request->url(), 'finalizeUpload')) {
+            return false;
+        }
+
+        return count(data_get($request->data(), 'finalizeUploadRequest.uploadedPartIds', [])) === 3;
+    });
+});
+
 test('linkedin publisher can publish a document (pdf carousel) with a title', function () {
     $this->postPlatform->update([
         'content_type' => ContentType::LinkedInPost,
diff --git a/tests/Feature/Services/Social/XPublisherTest.php b/tests/Feature/Services/Social/XPublisherTest.php
index ac3b8d2f..434d161a 100644
--- a/tests/Feature/Services/Social/XPublisherTest.php
+++ b/tests/Feature/Services/Social/XPublisherTest.php
@@ -304,3 +304,52 @@
     Http::assertSent(fn ($request) => str_contains($request->url(), '/finalize'));
     Http::assertSent(fn ($request) => str_contains($request->url(), '/2/tweets'));
 });
+
+test('x publisher uploads a large video in sequential 1MB segments', function () {
+    $this->post->update([
+        'media' => [
+            [
+                'id' => 'test-media-video',
+                'path' => 'media/2026-01/big-video.mp4',
+                'url' => 'https://example.com/media/2026-01/big-video.mp4',
+                'mime_type' => 'video/mp4',
+                'original_filename' => 'big-video.mp4',
+            ],
+        ],
+    ]);
+
+    $appendCount = 0;
+
+    Http::fake(function ($request) use (&$appendCount) {
+        $url = $request->url();
+
+        if (str_contains($url, '/2/media/upload/initialize')) {
+            return Http::response(['data' => ['id' => 'media_id_999']], 200);
+        }
+
+        if (str_contains($url, '/append')) {
+            $appendCount++;
+
+            return Http::response(null, 204);
+        }
+
+        if (str_contains($url, '/finalize')) {
+            return Http::response(['data' => ['id' => 'media_id_999']], 200);
+        }
+
+        if (str_contains($url, '/2/media/')) {
+            return Http::response(['processing_info' => ['state' => 'succeeded']], 200);
+        }
+
+        if (str_contains($url, '/2/tweets')) {
+            return Http::response(['data' => ['id' => '9876543210987654321', 'text' => 'Hello from X!']], 200);
+        }
+
+        // ~2.5MB download -> at least three 1MB segments.
+        return Http::response(str_repeat('x', (int) (2.5 * 1024 * 1024)), 200);
+    });
+
+    $this->publisher->publish($this->postPlatform);
+
+    expect($appendCount)->toBeGreaterThan(1);
+});