fix: drag and drop evidence upload in safari and backend file list validation

expenses/forms.py

@@ -12,6 +12,12 @@ import os
 
 class MultipleFileInput(forms.FileInput):
     allow_multiple_selected = True
+    
+    def value_from_datadict(self, data, files, name):
+        if hasattr(files, 'getlist'):
+            return files.getlist(name)
+        else:
+            return files.get(name)
 
 class MultipleFileField(forms.FileField):
     def __init__(self, *args, **kwargs):