make some changes

hyrax/app/models/concerns/s3_file_handleable.rb

@@ -16,7 +16,7 @@ module S3FileHandleable
 
     crc_dataset = self.class.name == "CrcDataset" ? self.class.find(self.id) : self.crc_dataset
     bucket_name = s3.sanitise_name(crc_dataset.id)
-    complex_modalities = self.class.name == "ComplexModality" ? [self] : self.complex_modalities.flatten
+    complex_modalities = self.class.name == "ComplexModality" ? [self] : self.complex_modalities.to_a.flatten
 
     complex_modalities.each do |modality|
       subject = modality.complex_subject