A recurring theme in Star Trek is time travel. E.g. in Star Trek: Picard, Season 2, when traveling back to the 21st century, Star Trek: First Contact, Star Trek: The Voyage Home, Janeway returning in time to help the U.S.S. Voyager returning home and so on.
So, the travel is always, from their perspective, to the past and then returning. I can't remember anybody traveling temporarily to the future and returning to their time line afterwards.
In Star Trek: Discovery, at the end of Season 2, the U.S.S. Discovery travels 950 years into the future. However, they don't travel back into their original time. Same with Burnham's mother. She travelled to the future and then temporarily back into the 23rd century.
So, the question is if somebody has, for a short period of time, travelled into the future and then returned to their original time? If somebody has, did they bring some of the future tech with them?