Apparatuses, methods, and systems are disclosed for establishing a multi-access data connection. One apparatus includes a processor and a transceiver that communicates with one or more network functions in a mobile communication network. The processor receives a first session management request containing: a second session management request sent by a UE, a first indication that the UE requests a single-access data connection and a second indication that the UE allows the network to upgrade the data connection. The processor sends a request to establish a data path for each access network with which the UE is registered, where each data path is anchored at a common user plane network function in the mobile communication network.