diff --git a/fileglancer/server.py b/fileglancer/server.py
index 78985b00..afd849b8 100644
--- a/fileglancer/server.py
+++ b/fileglancer/server.py
@@ -43,11 +43,50 @@
 from fileglancer.worker_pool import WorkerPool, WorkerError, WorkerDead
 from fileglancer import sshkeys
 
-from x2s3.utils import get_read_access_acl, get_nosuchbucket_response, get_error_response
+from x2s3.utils import get_read_access_acl, get_nosuchbucket_response, get_error_response, generate_request_id
 from x2s3.client_file import FileProxyClient
 from x2s3.client import ObjectHandle
 
 
+class RequestIdMiddleware:
+    """Pure ASGI middleware that attaches an S3-style x-amz-request-id header to
+    data-serving (proxy) responses.
+
+    x2s3 1.3.0 adds this header to every response from a standalone x2s3 server
+    via its own RequestIdMiddleware. Fileglancer, however, serves data links
+    through its own FastAPI app using x2s3's FileProxyClient directly, so x2s3's
+    middleware never runs for these responses. This carries the feature over:
+    clients (Neuroglancer/N5/Vizarr) get the same x-amz-request-id from
+    Fileglancer's /files/ proxy that they would from real S3 or x2s3, letting
+    them reference a specific request when correlating logs or reporting issues.
+
+    Scoped to the /files/ proxy paths since that is Fileglancer's S3-compatible
+    data-serving surface. Implemented as pure ASGI (rather than BaseHTTPMiddleware)
+    so it injects the header on the http.response.start event without re-wrapping
+    the body, leaving the file-streaming logic untouched.
+    """
+
+    def __init__(self, app):
+        self.app = app
+
+    async def __call__(self, scope, receive, send):
+        if scope["type"] != "http" or not scope.get("path", "").startswith("/files/"):
+            await self.app(scope, receive, send)
+            return
+
+        request_id = generate_request_id()
+        # Expose to downstream handlers/loggers via request.state.request_id
+        scope.setdefault("state", {})["request_id"] = request_id
+
+        async def send_with_request_id(message):
+            if message["type"] == "http.response.start":
+                headers = message.setdefault("headers", [])
+                headers.append((b"x-amz-request-id", request_id.encode("latin-1")))
+            await send(message)
+
+        await self.app(scope, receive, send_with_request_id)
+
+
 # Read version once at module load time
 def _read_version() -> str:
     """Read version from package metadata or package.json file"""
@@ -471,6 +510,11 @@ def mask_password(url: str) -> str:
     # This logs HTTP access information with authenticated username
     app.add_middleware(AccessLogMiddleware, settings=settings)
 
+    # Attach an S3-style x-amz-request-id header to data-link (/files/) responses,
+    # carrying over the feature added in x2s3 1.3.0 (which only applies it within
+    # x2s3's own app, not when Fileglancer proxies via FileProxyClient directly).
+    app.add_middleware(RequestIdMiddleware)
+
     # Generate random session_secret_key if not configured
     if settings.session_secret_key is None:
         settings.session_secret_key = secrets.token_urlsafe(32)
@@ -493,7 +537,7 @@ def mask_password(url: str) -> str:
         allow_credentials=True,
         allow_methods=["GET","HEAD","POST","PUT","PATCH","DELETE"],
         allow_headers=["*"],
-        expose_headers=["Range", "Content-Range"],
+        expose_headers=["Range", "Content-Range", "x-amz-request-id"],
     )
 
 
diff --git a/pixi.lock b/pixi.lock
index 07c59a79..cf713969 100644
--- a/pixi.lock
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       linux-aarch64:
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-      - pypi: https://files.pythonhosted.org/packages/c6/01/c330682e398978b2e151d9a6684826874e09b9319d565b6b6b73986093e5/x2s3-1.2.0-py3-none-any.whl
+      - pypi: https://files.pythonhosted.org/packages/b0/6c/c25618e34b8ba7c26ef4f3f84df70e9e6c0fc8aa3806d04c1ab952051c8f/x2s3-1.3.0-py3-none-any.whl
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       osx-64:
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 packages:
@@ -6735,8 +6735,8 @@ packages:
   timestamp: 1776177910241
 - pypi: ./
   name: fileglancer
-  version: 2.9.0a0
-  sha256: b0bf50ed7bbb44f49a542cfe928652b6bbbccd4c23154951bfefcc9c392461d7
+  version: 2.9.1a0
+  sha256: 05b85158ef8c78b168257f4b6e796b4f46cb61284e5b3e99c6529d7313345978
   requires_dist:
   - alembic>=1.17.0,<2
   - atlassian-python-api>=4.0.7,<5
@@ -6757,7 +6757,7 @@ packages:
   - python-jose>=3.5.0,<4
   - sqlalchemy>=2.0.44,<3
   - uvicorn>=0.38.0,<0.39
-  - x2s3>=1.2.0,<2
+  - x2s3>=1.3.0,<2
   - hatch ; extra == 'release'
   - twine ; extra == 'release'
   - coverage ; extra == 'test'
@@ -16101,10 +16101,10 @@ packages:
   - pkg:pypi/wrapt?source=hash-mapping
   size: 86073
   timestamp: 1772794899504
-- pypi: https://files.pythonhosted.org/packages/c6/01/c330682e398978b2e151d9a6684826874e09b9319d565b6b6b73986093e5/x2s3-1.2.0-py3-none-any.whl
+- pypi: https://files.pythonhosted.org/packages/b0/6c/c25618e34b8ba7c26ef4f3f84df70e9e6c0fc8aa3806d04c1ab952051c8f/x2s3-1.3.0-py3-none-any.whl
   name: x2s3
-  version: 1.2.0
-  sha256: 1ae2eb80355498a23e03265cc0ed1eefddd4fbf021c4b09a99bfbfd30952c9c1
+  version: 1.3.0
+  sha256: deb292575bd242004a903ba1bd1892d6528a91f501d348b932322fbf4f4131fe
   requires_dist:
   - aiobotocore>=2.22
   - boto3>=1.37
diff --git a/pyproject.toml b/pyproject.toml
index 0a81d630..82eb803d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -40,7 +40,7 @@ dependencies = [
     "sqlalchemy >=2.0.44,<3",
     "packaging >=24.0",
     "uvicorn >=0.38.0,<0.39",
-    "x2s3 >=1.2.0,<2",
+    "x2s3 >=1.3.0,<2",
     "py-cluster-api >=0.6.0,<0.7"
 ]
 
diff --git a/tests/test_endpoints.py b/tests/test_endpoints.py
index 0517bb85..a290f90d 100644
--- a/tests/test_endpoints.py
+++ b/tests/test_endpoints.py
@@ -320,6 +320,40 @@ def test_create_proxied_path_at_fsp_root(test_client, temp_dir):
     assert response.text == "hello root"
 
 
+def test_data_link_returns_request_id_header(test_client, temp_dir):
+    """Serving a data link must return an S3-style x-amz-request-id header.
+
+    Carries over the feature added in x2s3 1.3.0: clients (Neuroglancer/N5/Vizarr)
+    can reference a specific request when correlating logs or reporting issues.
+    The header should be a 16-char uppercase-alphanumeric string and unique per
+    request. It is scoped to the /files/ proxy surface, so non-data endpoints
+    must not carry it.
+    """
+    import re
+
+    response = test_client.post("/api/proxied-path?fsp_name=tempdir&path=.")
+    assert response.status_code == 200
+    sharing_key = response.json()["sharing_key"]
+
+    with open(os.path.join(temp_dir, "root_file.txt"), "w") as f:
+        f.write("hello root")
+
+    r1 = test_client.get(f"/files/{sharing_key}/tempdir/root_file.txt")
+    assert r1.status_code == 200
+    request_id = r1.headers.get("x-amz-request-id")
+    assert request_id is not None, "data-link response must include x-amz-request-id"
+    assert re.fullmatch(r"[A-Z0-9]{16}", request_id), \
+        f"x-amz-request-id should be 16 uppercase alphanumerics, got {request_id!r}"
+
+    # Unique per request
+    r2 = test_client.get(f"/files/{sharing_key}/tempdir/root_file.txt")
+    assert r2.headers.get("x-amz-request-id") != request_id
+
+    # Scoped to data links: non-/files/ endpoints must not carry the header
+    api_response = test_client.get("/api/version")
+    assert "x-amz-request-id" not in api_response.headers
+
+
 def test_get_proxied_path_at_fsp_root_normalizes_dot(test_client):
     """Sidebar's `is there a link for the current folder?` query uses path='.'
     when the user is at the FSP root. After creating a link at the FSP root,