Adding non-cohabiting partner to work permit

I've been with my partner for almost 10 years - we lived together for a few years and have lived apart in recent years as we're now both homeowners (one of us became a homeowner very early on in our relationship while the other was not). The plan was always to do this until we got married - at which point we've live together again in one of our places.

Living like this has never been a problem for us, we see each other regularly and stay over at the other's place on weekends/when we're not working. But now that we're going through the work permit process, we need to provide proof of cohabitation which we have for the few years we lived together but not for the past two when we didn't.

We do, however, have a ton of photos together, bookings from trips we've been on every year of our relationship (including another planned for a few weeks time), plus confirmation details of our upcoming wedding plans.

Has anyone been in a similar position? Did this slow down your partner's work permit process? What did you have to provide to prove your relationship?

TIA x