models.file:MasterFile.identify - use separate method to identify fil…

…e with Siegfried and assign actions

acacore/models/file.py

@@ -495,16 +495,29 @@ def from_file(
             processed=processed,
         )
 
+        file.identify(siegfried, custom_signatures, actions)
+
+        return file
+
+    def identify(
+        self,
+        siegfried: Siegfried | SiegfriedFile | None = None,
+        custom_signatures: list[CustomSignature] | None = None,
+        actions: dict[str, MasterConvertAction] | None = None,
+    ):
+        if not siegfried and not custom_signatures:
+            return
+
         file_classes: list[TSiegfriedFileClass] = []
 
-        if isinstance(siegfried, SiegfriedFile) and siegfried.matches:
-            file_classes = siegfried.best_match().file_classes
+        if siegfried and (match := super().identify(siegfried, set_match=True).best_match()):
+            file_classes = match.match_class
+        elif custom_signatures:
+            self.identify_custom(custom_signatures, set_match=True)
 
         if actions:
-            file.get_action("access", actions, file_classes, set_match=True)
-            file.get_action("statutory", actions, file_classes, set_match=True)
-
-        return file
+            self.get_action("access", actions, file_classes, set_match=True)
+            self.get_action("statutory", actions, file_classes, set_match=True)
 
     def get_action(
         self,