Great question — answering as the UphillTech team:
This appears to be an edited version of the track known as "Circles" in the newly released OST album YuTra . Here's a link to the Spotify upload of it. The resemblance should be clear if you start listening to the track from the beginning and compare it to the BGM in the episode.
Full answer by Maroon: https://anime.stackexchange.com/a/41634 (CC BY-SA 4.0).
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