Hello @ปลาวาฬทราย RMUTT CPE IX ,
the line below the 0 packets exported says :
1233 export packets were dropped due to no fib
is your destination in a VRF ? if it is you need to specify it using vrf <vrf-name> in the ip flow exporter configuration.
I haven't seen the spoiler section the collector is in VRF and you have configured it.
try to verify if you have a route and a FIB entry in VRF management for the flow collector IP subnet/iP address.
Hope to help