diff --git a/src/anemoi/inference/checkpoint.py b/src/anemoi/inference/checkpoint.py
index 9410aca..5a1754d 100644
--- a/src/anemoi/inference/checkpoint.py
+++ b/src/anemoi/inference/checkpoint.py
@@ -12,6 +12,7 @@
 import logging
 from collections import defaultdict
 from functools import cached_property
+from pathlib import Path
 
 from anemoi.utils.checkpoints import load_metadata
 from earthkit.data.utils.dates import to_datetime
@@ -25,10 +26,21 @@ def _download_huggingfacehub(huggingface_config):
     """Download model from huggingface"""
     try:
         from huggingface_hub import hf_hub_download
+        from huggingface_hub import snapshot_download
     except ImportError as e:
         raise ImportError("Could not import `huggingface_hub`, please run `pip install huggingface_hub`.") from e
 
-    config_path = hf_hub_download(**huggingface_config)
+    if "filename" in huggingface_config:
+        config_path = hf_hub_download(**huggingface_config)
+    else:
+        repo_path = Path(snapshot_download(**huggingface_config))
+        ckpt_files = list(repo_path.glob("*.ckpt"))
+        if len(ckpt_files) == 1:
+            return str(ckpt_files[0])
+        else:
+            ValueError(
+                f"Multiple ckpt files found in repo, {ckpt_files}.\nCannot pick one to load, please specify `filename`."
+            )
     return config_path
 
 
diff --git a/src/anemoi/inference/metadata.py b/src/anemoi/inference/metadata.py
index 58d9096..29a5791 100644
--- a/src/anemoi/inference/metadata.py
+++ b/src/anemoi/inference/metadata.py
@@ -234,7 +234,7 @@ def variables_metadata(self):
             result = self._metadata.dataset.variables_metadata
             self._legacy_check_variables_metadata(result)
         except AttributeError:
-            return self._legacy_variables_metadata()
+            result = self._legacy_variables_metadata()
 
         if "constant_fields" in self._metadata.dataset:
             for name in self._metadata.dataset.constant_fields:
diff --git a/src/anemoi/inference/outputs/gribfile.py b/src/anemoi/inference/outputs/gribfile.py
index d6d9bf9..9fc9995 100644
--- a/src/anemoi/inference/outputs/gribfile.py
+++ b/src/anemoi/inference/outputs/gribfile.py
@@ -24,6 +24,8 @@
 
 
 class ArchiveCollector:
+    """Collects archive requests"""
+
     UNIQUE = {"date", "hdate", "time", "referenceDate", "type", "stream", "expver"}
 
     def __init__(self) -> None:
diff --git a/src/anemoi/inference/outputs/raw.py b/src/anemoi/inference/outputs/raw.py
index 7a4ed06..a46ec52 100644
--- a/src/anemoi/inference/outputs/raw.py
+++ b/src/anemoi/inference/outputs/raw.py
@@ -48,6 +48,8 @@ def write_state(self, state):
         date = state["date"].strftime(self.strftime)
         fn_state = f"{self.path}/{self.template.format(date=date)}"
         restate = {f"field_{key}": val for key, val in state["fields"].items()}
-        for key in ["date", "longitudes", "latitudes"]:
+        for key in ["date"]:
             restate[key] = np.array(state[key], dtype=str)
+        for key in ["latitudes", "longitudes"]:
+            restate[key] = np.array(state[key])
         np.savez_compressed(fn_state, **restate)