Import of Referenced Drawings

Greetings. 

This is my first post on the forum - my CAD abilities are average!

On Draftsight, I have managed to import referenced drawings (i.e. Xrefs) as I need them, however, they disappear if the drawing is closed and opened again. The references drawings are saved within the same folder as the drawing I am working on. 

The 're-load all' tab does not bring the referenced drawings back.

I have to re-attach the referenced drawing again (the command bar says they are already 'defined') and then click 're-load all' - this brings the referenced drawings back. 

Any assistance on how I can ensure referenced drawings remain in my drawing after closing and re-opening would be gratefully received. 

Thanks 

Steven

SolidworksImport/export