Question: "Tears Dry on Their Own" was a song by Amy Winehouse featured in the documentary "Amy" about what struggle that caused her death?

Context paragraphs:
Dionne Bromfield: Dionne Julia Bromfield (born 1 February 1996) is an English singer, songwriter, TV presenter and television personality.  Bromfield's debut album, "Introducing Dionne Bromfield", was released in 2009 by Amy Winehouse's Lioness Records label.  She first came to public attention after performing on the British TV show "Strictly Come Dancing" with Amy Winehouse on backing vocals.  She is known for being one of the former presenters on "Friday Download".

Back to Black: Back to Black is the second and final studio album by English singer and songwriter Amy Winehouse, released on 27 October 2006 by Island Records.  The album spawned five singles: "Rehab", "You Know I'm No Good", "Back to Black", "Tears Dry on Their Own" and "Love Is a Losing Game".  "Back to Black" was acclaimed by music critics, who praised Salaam Remi and Mark Ronson's production, as well as Winehouse's songwriting and emotive singing style.

Lioness: Hidden Treasures: Lioness: Hidden Treasures is a posthumous compilation album by English singer and songwriter Amy Winehouse.  It was released on 2 December 2011 by Island Records.  It was her third album, and features unreleased songs and demos selected by Mark Ronson, Salaam Remi and Winehouse's family, including the first single, "Body and Soul", with Tony Bennett.  The album was released in aid of the Amy Winehouse Foundation. " Our Day Will Come" was released as the album's second and final single on 4 December, and was Winehouse's first solo single to be released since 2007.

Tears Dry on Their Own: "Tears Dry on Their Own" is a song by English singer and songwriter Amy Winehouse from her second and final studio album "Back to Black" (2006).  "Tears Dry on Their Own" was released as the fourth single from "Back to Black" on 13 August 2007.  While the melody and lyrics are composed by Winehouse, the music behind her voice is a sample interpolation of Marvin Gaye and Tammi Terrell's 1967 Motown classic hit "Ain't No Mountain High Enough", penned by the married duo of Ashford & Simpson.  The original ballad version of the track is featured on the posthumous album "" (2011).  The song was featured in the documentary film based on the life and death of Winehouse, "Amy" (2015) and was also included on the film's soundtrack.

Stronger Than Me: "Stronger Than Me" is a song by English singer and songwriter Amy Winehouse from her debut studio album "Frank" (2003).  Written by Winehouse and Salaam Remi, "Stronger Than Me" was released in the United Kingdom as the lead single on 6 October 2003, it ended up as the lowest-charting single from "Frank" and of Winehouse's career, peaking at number 71 on the UK Singles Chart.  The song nevertheless won the Ivor Novello Award for Best Contemporary Song Musically and Lyrically in 2004.

Back to Black (song): "Back to Black" is a song by English singer and songwriter Amy Winehouse.  It was released by Island Records on 30 April 2007 as the third single from Winehouse's second and final studio album of the same name.  The song was written by Winehouse and Mark Ronson, and produced by Ronson.  "Back to Black" was inspired by Winehouse's relationship with Blake Fielder-Civil, who had left her for an ex-girlfriend.

Amy Winehouse at the BBC: Amy Winehouse at the BBC is a posthumous live album by English singer and songwriter Amy Winehouse.  It was released on 12 November 2012 by Universal Music Group.  The album, along with Winehouse's previous record "", was released in aid of the Amy Winehouse Foundation.  It features live songs performed by Winehouse at BBC specials during 2004 to 2009.

Amy (2015 film): Amy is a 2015 British documentary film about the life and death of British singer-songwriter Amy Winehouse.  Directed by Asif Kapadia and produced by James Gay-Rees, George Pank, and Paul Bell and co-produced by Krishwerkz Entertainment, On The Corner Films, Playmaker Films, and Universal Music, in association with Film 4.  The film covers Winehouse's life and her struggle with substance abuse, both before and after her career blossomed, and which eventually caused her death.

Rehab (Amy Winehouse song): "Rehab" is a song written and performed by English singer and songwriter Amy Winehouse, from her second and final studio album "Back to Black" (2006).  Produced by Mark Ronson, the lyrics are autobiographical and address Winehouse's refusal one time to enter a rehabilitation clinic.  "Rehab" was released as the lead single from "Back to Black" on 23 October 2006, and it peaked at number 7 in the United Kingdom on its Singles Chart and number 9 in the United States on the "Billboard" Hot 100, becoming Winehouse's only top 10 hit in the US.

Amy Winehouse Foundation: The Amy Winehouse Foundation is a registered charity in England and Wales (number 1143740), set up in memory of English singer-songwriter Amy Winehouse (1983–2011).

Supporting paragraphs: Tears Dry on Their Own Amy (2015 film)
Answer: substance abuse