I recently sent a Nitro Classic gift to someone as I've started doing regularly. However, they already had a Nitro Classic gift in place and working. Even though they had the existing gift running, when they Accepted the new gift, it wasn't obviously clear where it was and how to get to it. It took several days and some back and forth with support to figure out they had to go in like they were going to subscribe for a month and then use their gift/credit to pay for it.
It's not obvious, nor easy to sort out where to go to redeem the gift/credit after it was accepted, instead of just extending the time.
It would be VERY helpful if accepting a gift while you already have a running gift/subscription that it just automatically extend the current gift, or place the accepted gift into the inventory to be activated there.