Yes, but you cannot use the AttributeFileWriter. You’ll have to use a regular writer, I recommend using the Data File writer, which lets you write arbitrary binary data:https://docs.safe.com/fme/html/FME-Form-Documentation/FME-ReadersWriters/datafile/datafile.htm

Make sure to associate the writer with the streaming service when publishing to Flow.

Perfect. It worked a treat. I must admit I’ve never seen the datafile writer.  So many writers to keep track of…. 

Thank you.