In February 2018, the singer (then known under her original name, Aitana Ocaña), was proclaimed the second finalist of the Spanish talent show Operación Triunfo, in its ninth edition.

In April 2018 it was reported that Aitana had traveled to Los Angeles to give shape to her first musical project.

[4] After the promotion given to her first single, "Lo malo", ended, she moved away from social networks and the public eye to give the final touches to what would later be Tráiler.

[5] On 25 October, the singer visited the Spanish talk show El Hormiguero 3.0. where she unveiled the name of her first project.

The time interval between the two EPs will be little more than two-three months because I think that today we devour more than we consume and, for that reason, I like the idea of doing everything little by little.

"[7][8] A few weeks later, on 13 November, the singer unveiled via her social media the cover of the EP, which was photographed by Valero Rioja.

[14] During Aitana's visit to El Hormiguero 3.0 in October 2018, she commented that she would be recording a music video for the official remix of "Teléfono" in California at the end of that month.