How would you advise reading a csv for MD5 hash matches from a list of hashes?

why do I keep getting

UnicodeDecodeError: ‘utf-8’ codec can’t decode bytes in position 15-16: invalid continuation byte

when im using the Filter Bytes action from the csv plugin

what is the right input to use here?

{{[“new email”].[icon_email].[flattened_attached_files].[0].[content]}}