Data Exchange: How to Change Encoding?

I have a data source setup as a "File" type. Sometimes UTF-8 makes sense to use on an integration uploading data via a file and other times I need to use UTF-16LE using a File data source on a different integration. I cannot think of what else I need to try to allow me to select the encoding format I want to use on a given integration. Every time the integration is defaulting itself defaults back to UTF-8 even if I save the integration using UTF-16LE. How do I use the encoding options to select what I need for a