diff --git a/api/core/sandbox/inspector/base.py b/api/core/sandbox/inspector/base.py
index a5b783aff2..76f92a4f97 100644
--- a/api/core/sandbox/inspector/base.py
+++ b/api/core/sandbox/inspector/base.py
@@ -15,26 +15,6 @@ class SandboxFileSource(abc.ABC):
         self._app_id = app_id
         self._sandbox_id = sandbox_id
 
-    @staticmethod
-    def _guess_image_content_type(path: str) -> str | None:
-        image_mime_types = {
-            "jpg": "image/jpeg",
-            "jpeg": "image/jpeg",
-            "png": "image/png",
-            "gif": "image/gif",
-            "bmp": "image/bmp",
-            "tiff": "image/tiff",
-            "tif": "image/tiff",
-            "webp": "image/webp",
-            "svg": "image/svg+xml",
-            "ico": "image/vnd.microsoft.icon",
-            "heif": "image/heif",
-            "heic": "image/heic",
-        }
-
-        extension = path.split(".")[-1]
-        return image_mime_types.get(extension)
-
     @abc.abstractmethod
     def exists(self) -> bool:
         """Check if the sandbox source exists and is available.
diff --git a/api/core/sandbox/inspector/runtime_source.py b/api/core/sandbox/inspector/runtime_source.py
index 5300ca633a..639b1d66d5 100644
--- a/api/core/sandbox/inspector/runtime_source.py
+++ b/api/core/sandbox/inspector/runtime_source.py
@@ -161,21 +161,9 @@ print(json.dumps(entries))
                     logger.debug("Failed to cleanup temp archive %s: %s", archive_path, exc)
         else:
             try:
-                content_type = self._guess_image_content_type(path)
-                command = [
-                    "curl",
-                    "-s",
-                    "-f",
-                    "-X",
-                    "PUT",
-                ]
-                if content_type:
-                    # to support image preview in artifacts panel, we need add content-type when upload to S3
-                    command.extend(["-H", f"Content-Type: {content_type}"])
-                command.extend(["-T", path, upload_url])
                 execute(
                     self._runtime,
-                    command,
+                    ["curl", "-s", "-f", "-X", "PUT", "-T", path, upload_url],
                     timeout=self._UPLOAD_TIMEOUT_SECONDS,
                     error_message="Failed to upload file from sandbox",
                 )