XML export questions

Three questions:

  1. When I export an XML of a hymn and then re-import it to check, the stem direction is off:

I didn’t change any stem direction, just used upstem and downstem voice 1 and hid rests as needed.

  1. Is there a way to batch-export XMLs? I have to do about 500.

  2. When I import an XML file direcetly from the hub, what settings is Dorico using for the new file?