As criticism of Uber has mounted over the past month, one of its most prominent partners has discussed whether to continue its relationship with the company.

Spotify decided not to participate in a press campaign about an upcoming update to the Uber app, The Verge has learned.

In an internal company-wide email, the company's head of product refers to discussions the company held about ending Uber's API access, which allows riders to control a driver's sound system from their smartphones.

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"For me, given the views I've shared with you regarding Uber and the practices that have been on display there recently, even staying on Uber is not a straightforward decision," wrote Gustav Söderström, Spotify's head of product.