@stephenpeacockcreativenet,
Ok we have two things here.
Bio
In the “Documentation” tab it is explained. You can use “description” key to import it (this is a basic WordPress user data).
Cover photos
WordPress does not save the photo of the user by default, so it takes directly from Gravatar. Users have to upload their photos to Gravatar and email will relate it. This plugin does not participate in this process.
If you have another plugin to manage profile photos and you want to upload photos in other way, tell me and we see how to do it.