diff --git a/sleap_roots/series.py b/sleap_roots/series.py
index 5b98228..75a9eba 100644
--- a/sleap_roots/series.py
+++ b/sleap_roots/series.py
@@ -97,25 +97,34 @@ def load(
         # Attempt to load the predictions, with error handling
         try:
             if primary_name:
-                primary_path = (
-                    Path(series_name).with_suffix(f".{primary_name}.slp").as_posix()
-                )
+                if Path(primary_name).as_posix().endswith(".slp"):
+                    primary_path = primary_name
+                else:
+                    primary_path = (
+                        Path(series_name).with_suffix(f".{primary_name}.slp").as_posix()
+                    )
                 if Path(primary_path).exists():
                     primary_labels = sio.load_slp(primary_path)
                 else:
                     print(f"Primary prediction file not found: {primary_path}")
             if lateral_name:
-                lateral_path = (
-                    Path(series_name).with_suffix(f".{lateral_name}.slp").as_posix()
-                )
+                if lateral_name.endswith(".slp"):
+                    lateral_path = lateral_name
+                else:
+                    lateral_path = (
+                        Path(series_name).with_suffix(f".{lateral_name}.slp").as_posix()
+                    )
                 if Path(lateral_path).exists():
                     lateral_labels = sio.load_slp(lateral_path)
                 else:
                     print(f"Lateral prediction file not found: {lateral_path}")
             if crown_name:
-                crown_path = (
-                    Path(series_name).with_suffix(f".{crown_name}.slp").as_posix()
-                )
+                if crown_name.endswith(".slp"):
+                    crown_path = crown_name
+                else:
+                    crown_path = (
+                        Path(series_name).with_suffix(f".{crown_name}.slp").as_posix()
+                    )
                 if Path(crown_path).exists():
                     crown_labels = sio.load_slp(crown_path)
                 else:
@@ -385,7 +394,21 @@ def find_all_h5_series(data_folders: Union[str, List[str]]) -> List[str]:
 
 
 def find_all_slp_series(data_folders: Union[str, List[str]]) -> List[str]:
-    """Find all .slp series from a list of folders."""
+    """Find all .slp series from a list of folders.
+
+    Args:
+        data_folders: Path or list of paths to folders containing .slp series.
+
+    Returns:
+        A list of unique series names derived from the filenames.
+    """
+    if type(data_folders) != list:
+        data_folders = [data_folders]
+
+    slp_series = []
+    for data_folder in data_folders:
+        slp_series.extend([Path(p).as_posix() for p in Path(data_folder).glob("*.slp")])
+    return list(set([Path(p).name.split(".")[0] for p in slp_series]))
 
 
 def imgfig(