diff --git a/server/main.py b/server/main.py
index 1cbf52a..2f10373 100644
--- a/server/main.py
+++ b/server/main.py
@@ -62,6 +62,7 @@ def walk_archive_paths(base_path: str, file_paths: List[str]) -> List[Archive]:
     size = 0
     for file in file_paths:
         full_path = base / file.strip("/")
+        print(full_path)
 
         if full_path.is_file():
             zip_paths.append({"fs": str(full_path), "n": full_path.name})
@@ -78,6 +79,12 @@ def walk_archive_paths(base_path: str, file_paths: List[str]) -> List[Archive]:
                 )
                 size += file_path.stat().st_size
                 raise_for_size(size)
+        else:
+            # No file/folder exists at the requested path, so raise a 404.
+            raise HTTPException(
+                status_code=404,
+                detail="One or more of the requested files could not be found.",
+            )
 
     return zip_paths
 
diff --git a/server/tests/test_utils.py b/server/tests/test_utils.py
index fd4b412..f95bc78 100644
--- a/server/tests/test_utils.py
+++ b/server/tests/test_utils.py
@@ -64,6 +64,12 @@ def test_walk_archive(tmp_path):
     ]
 
 
+def test_walk_archive_404(tmp_path):
+    base = tmp_path
+    with pytest.raises(HTTPException):
+        walk_archive_paths(base, ["nonexistent_file.txt"])
+
+
 @pytest.fixture
 def mock_get_success(monkeypatch, request):
     import requests