diff --git a/packages/aws-lambda/src/sdk/deploySite.test.ts b/packages/aws-lambda/src/sdk/deploySite.test.ts
index bd041bd10d..6634bd24cf 100644
--- a/packages/aws-lambda/src/sdk/deploySite.test.ts
+++ b/packages/aws-lambda/src/sdk/deploySite.test.ts
@@ -6,7 +6,7 @@ import { join } from "node:path";
 import { createHash } from "node:crypto";
 import type { S3Client } from "@aws-sdk/client-s3";
 import { AUDIO_SIDECAR_MIN_BYTES } from "@hyperframes/producer/distributed";
-import { audioSidecarUri } from "../contentStore.js";
+import { audioSidecarUri, probeFactsUri } from "../contentStore.js";
 import { parseSiteManifest } from "../siteManifest.js";
 import { asS3Client, FakeS3 } from "./__fixtures__/fakeS3.js";
 import { deploySite } from "./deploySite.js";
@@ -275,3 +275,52 @@ describe.skipIf(!HAS_FFMPEG)("deploySite audio sidecars", { timeout: 60_000 }, (
     expect(notices[0]).toContain("ffmpeg");
   });
 });
+
+describe.skipIf(!HAS_FFMPEG)("deploySite probe facts", { timeout: 60_000 }, () => {
+  function addVideo(): void {
+    const made = spawnSync(FFMPEG, [
+      ...["-v", "error", "-y", "-f", "lavfi", "-i", "testsrc2=size=64x64:rate=25:duration=2"],
+      ...["-c:v", "mpeg4", join(projectDir, "assets", "take.mp4")],
+    ]);
+    expect(made.status).toBe(0);
+  }
+
+  it("stores each video's ffprobe JSON beside it, and leaves the site's file list as it was", async () => {
+    addVideo();
+    const s3 = new FakeS3();
+    const site = await deploySite({ projectDir, bucketName: "test-bucket", s3: asS3Client(s3) });
+
+    const take = parseSiteManifest(
+      s3.bodies.get(`test-bucket/sites/${site.siteId}/files.json`)?.toString() ?? "",
+    ).find((file) => file.path === "assets/take.mp4");
+    const facts = probeFactsUri("test-bucket", take?.sha256 ?? "").replace("s3://", "");
+    expect(JSON.parse(s3.bodies.get(facts)?.toString() ?? "{}").streams[0].codec_type).toBe("video");
+    expect(sitePaths(s3, site.siteId)).toEqual([
+      "assets/style.css",
+      "assets/take.mp4",
+      "index.html",
+    ]);
+  });
+
+  it("deploys the same site with no probe stored when there is no ffprobe, and says so", async () => {
+    addVideo();
+    const notices: string[] = [];
+    const before = process.env.HYPERFRAMES_FFPROBE_PATH;
+    process.env.HYPERFRAMES_FFPROBE_PATH = join(scratch, "no-such-ffprobe");
+    const s3 = new FakeS3();
+    try {
+      await deploySite({
+        projectDir,
+        bucketName: "test-bucket",
+        s3: asS3Client(s3),
+        onNotice: (message) => notices.push(message),
+      });
+    } finally {
+      if (before === undefined) delete process.env.HYPERFRAMES_FFPROBE_PATH;
+      else process.env.HYPERFRAMES_FFPROBE_PATH = before;
+    }
+
+    expect([...s3.existing].filter((id) => id.endsWith(".probe.v1.json"))).toEqual([]);
+    expect(notices.some((message) => message.includes("ffprobe"))).toBe(true);
+  });
+});
diff --git a/packages/aws-lambda/src/siteManifest.test.ts b/packages/aws-lambda/src/siteManifest.test.ts
index 87b4386576..f8994093d4 100644
--- a/packages/aws-lambda/src/siteManifest.test.ts
+++ b/packages/aws-lambda/src/siteManifest.test.ts
@@ -3,7 +3,7 @@ import { mkdtempSync, rmSync } from "node:fs";
 import { tmpdir } from "node:os";
 import { join } from "node:path";
 import { S3Client } from "@aws-sdk/client-s3";
-import { audioSidecarUri, contentStoreUri } from "./contentStore.js";
+import { audioSidecarUri, contentStoreUri, probeFactsUri } from "./contentStore.js";
 import { FakeS3 } from "./sdk/__fixtures__/fakeS3.js";
 import { downloadSiteFiles, serializeSiteManifest, siteManifestUri } from "./siteManifest.js";
 
@@ -70,4 +70,19 @@ describe("downloadSiteFiles", () => {
     expect(remote["takes/camera.mov"]?.url).toBeString();
     expect(remote["takes/camera.mov"]?.audioSidecarUrl).toBeUndefined();
   });
+
+  it("hands a remote video's stored probe along with it, when one is stored", async () => {
+    const fake = new FakeS3();
+    const manifestUri = siteWithVideo(fake);
+    fake.existing.add(probeFactsUri("bucket", VIDEO_SHA).replace("s3://", ""));
+
+    const remote = await downloadSiteFiles(
+      clientOver(fake),
+      manifestUri,
+      join(dir, "project"),
+      true,
+    );
+
+    expect(remote["takes/camera.mov"]?.probeFactsUrl).toContain(`${VIDEO_SHA}.probe.v1.json`);
+  });
 });