ESB ack not received

Hi, I'm using nrf52840DK.

I set the selective_auto_ack as true. It should be able to adopt dynamic ack (or ack payload). 

I have two data packets, which are ch_pkt and sync_pkt. Both are using .noack=true. And what I trying to do is to change sync_pkt into .noack=false. I also need to add payload in ack.

However, once I set up .noack=false. PRX can only receive two sync_pkt. Not to mention whether TX received the ACK payload.

Do I miss something or ...? Tks a lot for helping.

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