[1] He decided to include Camila Cabello after hearing her 2017 song "Never Be the Same" on the radio, stating that it "cuts so hard, but she delivers a lot of emotion".

[12][13][14] According to the sheet music published at Musicnotes.com by BMG Rights Management, the song is based on 44 common time, with a tempo of 104 beats per minute, and is played in the key of C minor.

[16] The instrumentation challenged Cabello's vocals, as they deviated from her previous pop songs, which consisted of a trap drum kit and top 40 sounds.

[11] Writing for Billboard, Andrew Unterberger stated that Cabello's versatile vocals were similar to that of Charli XCX and Kim Petras, noting that both artists had songs which were included on Spotify's New Music Friday playlist the same week.

[14] The song's middle eight contains a mellifluous vocoder,[17][18] as Cabello transitions from singing in a ballad-style manner in the chorus, to each verse in a "sing-speak-y falsetto" with a bubblegum pop cadence.

[11][18] Brittany Spanos of Rolling Stone compared her vocodered vocals on the ramped up second verse to Taylor Swift's 2018 song "Delicate".

[19] Amanda Mitchell of O, The Oprah Magazine suggested that the song was written about Ronson's divorce from French actress Joséphine de La Baume.

[7] Variety staff member Jem Aswad stated that it was "the most pop-friendly track" on Late Night Feelings, commending the "sultry melody" and "comfortable groove".

[17] Writing for Bandwagon, Indran Paramasivam stated that "Find U Again" is a "mood-perfect herald" for Late Night Feelings, describing it as "high-gloss, bass-forward pop with a tear-stained heft".

[9] Spanos praised Ronson's light and fresh production, which "never overshadows Cabello's effectively minimalistic delivery" and acknowledged that she has the "innate ability to add that extra, inexplicably something to anything she touches".

[20] Writing for Uproxx, Chloe Gilke stated that Cabello's vocals perfectly matched the song's "moody melancholy" theme, which she similarly compared to her debut 2018 studio album Camila in "finding the beauty in distress and ugly feelings".

[22] Paper staff member Brendan Wetmore acknowledged that "Find U Again" "far exceeded expectations", commending the drastic shift in tone from Cabello's previous ventures such as Fifth Harmony and Camila.

[32] Cabello also shared an image on Instagram, which showed her with blonde hair and a fringe, pink lips, and kohl surrounding her eyes.

[42] Writing for Billboard, Kirsten Spruch stated that the music video's retro and vintage atmosphere matched Ronson's production, which reminded her of old western films.

[42] Israel Daramola of Spin thought that it was complete with a car chase and the evocative presence of people,[35] while Gilke considered the music video to be "strikingly cinematic".

[39] Mabel performed a cover of "Find U Again" on BBC Radio 1's Live Lounge segment,[43] which was uploaded to its official Vevo account on 7 August 2019.