diff --git a/metagpt/roles/di/role_zero.py b/metagpt/roles/di/role_zero.py
index 49b6c3616..8b1ab2267 100644
--- a/metagpt/roles/di/role_zero.py
+++ b/metagpt/roles/di/role_zero.py
@@ -286,7 +286,7 @@ class RoleZero(Role):
             return rsp_msg, ""
 
         # routing
-        memory = self.get_memories(k=4)  # FIXME: A magic number for two rounds of Q&A
+        memory = self.get_memories(k=self.memory_k)
         context = self.llm.format_msg(memory + [UserMessage(content=QUICK_THINK_PROMPT)])
         async with ThoughtReporter() as reporter:
             await reporter.async_report({"type": "classify"})
diff --git a/metagpt/utils/common.py b/metagpt/utils/common.py
index def127fc9..e98297ef5 100644
--- a/metagpt/utils/common.py
+++ b/metagpt/utils/common.py
@@ -842,7 +842,7 @@ def decode_image(img_url_or_b64: str) -> Image:
 
 def extract_image_paths(content: str) -> bool:
     # We require that the path must have a space preceding it, like "xxx /an/absolute/path.jpg xxx"
-    pattern = r"[^\s]+\.(?:png|jpe?g|gif|bmp|tiff)"
+    pattern = r"[^\s]+\.(?:png|jpe?g|gif|bmp|tiff|PNG|JPE?G|GIF|BMP|TIFF)"
     image_paths = re.findall(pattern, content)
     return image_paths