currently using a CORE sensor, and as far as I know data can be imported in Intervals.icu only via tha original .FIT file, since temperature data are not uploaded to Strava.
This means that either I upload from Strava (nice or activity title, notes, etc.) and I don’t get temperature data, either I upload from .FIT files, losing all the above but getting temperature data.
That doesn’t necessarily have to be the case I think. It depends how you record your activity.
For example if I record an activity with my Garmin watch (that’s linked to both Strava and Intervals) I get both activities in Intervals and Intervals prefers the Garmin one, but when I change the title of my ride on Strava it gets changed in Intervals as well.