STM32WB55xx STM32WB35xx BLE 5.0 minimum required time for maximum throughput. Connection is getting lost during the transfer of data more than 100Kbytes.

Hello

1. We are using STM32WB55xx STM32WB35xx Nucleo board with STM Ble stack.
2. We want to transfer data around 2Mbytes after connection.
3. After connection, we are only able to transfer around 100Kbytes of data after that connection is getting lost.
4. What is maximum MTU supported by stack?
5. Any examples which support maximum data transfer of 1Mbytes.
6. Any configuration settings which will increase data throughput.