Can we update the information stored on an imported record?

Yes, just search for the person within your network, and then click the 'Edit' button on the full profile. Here you’ll be able to add another CV, change their showreel URL and contact info.

If/when the person activates the account created during your import, this will supersede the imported record in your network. Once activated, ownership of that record will be transferred over to the individual, so you won't be able to edit it.