Follow Me Custom -- Where to add it?

I’d like to add some functionality in the follow me context. I see that there is a “ext-findmefollow-custom”.

But where do I add this context, in which file?

I have 3 files

extensions.conf
extensions_additional.conf
extensions_custom.conf

I have tried it adding in extensions_custom.conf

[ext-findmefollow-custom]
exten => s,1,NoOp(I am in Custom Follow me)

I don’t see this called anywhere in the logs.

[ext-findmefollow]
include => ext-findmefollow-custom
exten => FM8479049212,1,Goto(8479049212,FM8479049212)
exten => 8479049212,1,GotoIf($[ “${DB(AMPUSER/8479049212/followme/ddial)}” = “EXTENSION” ]?ext-local,8479049212,1)
exten => 8479049212,n(FM8479049212),Macro(user-callerid,)
exten => 8479049212,n,GotoIf($[“foo${BLKVM_OVERRIDE}” = “foo”]?skipdb)
exten => 8479049212,n,GotoIf($["${DB(${BLKVM_OVERRIDE})}" = “TRUE”]?skipov)
exten => 8479049212,n(skipdb),Set(__NODEST=)
exten => 8479049212,n,Set(__BLKVM_OVERRIDE=BLKVM/${EXTEN}/${CHANNEL})
exten => 8479049212,n,Set(__BLKVM_BASE=${EXTEN})
exten => 8479049212,n,Set(DB(${BLKVM_OVERRIDE})=TRUE)
exten => 8479049212,n(skipov),Set(RRNODEST=${NODEST})
exten => 8479049212,n(skipvmblk),Set(__NODEST=${EXTEN})
exten => 8479049212,n,Set(RecordMethod=Group)
exten => 8479049212,n,Macro(record-enable,${DB(AMPUSER/8479049212/followme/grplist)},${RecordMethod})
exten => 8479049212,n(skipsimple),Set(RingGroupMethod=ringallv2)
exten => 8479049212,n,Set(_FMGRP=8479049212)
exten => 8479049212,n(DIALGRP),GotoIf($[ “${DB(AMPUSER/8479049212/followme/grpconf)}” = “ENABLED” ]?doconfirm)
exten => 8479049212,n,Macro(dial,$[ ${DB(AMPUSER/8479049212/followme/grptime)} + ${DB(AMPUSER/8479049212/followme/prering)} ],${DIAL_OPTIONS},${DB(AMPUSER/8479049212/followme/grplist)})
exten => 8479049212,n,Goto(nextstep)
exten => 8479049212,n(doconfirm),Macro(dial-confirm,$[ ${DB(AMPUSER/8479049212/followme/grptime)} + ${DB(AMPUSER/8479049212/followme/prering)} ],${DIAL_OPTIONS},${DB(AMPUSER/8479049212/followme/grplist)},8479049212)
exten => 8479049212,n(nextstep),Set(RingGroupMethod=)
exten => 8479049212,n,GotoIf($[“foo${RRNODEST}” != “foo”]?nodest)
exten => 8479049212,n,Set(__NODEST=)
exten => 8479049212,n,dbDel(${BLKVM_OVERRIDE})
exten => 8479049212,n,Goto(ext-local,vmu8479049212,1)
exten => 8479049212,n(nodest),Noop(SKIPPING DEST, CALL CAME FROM Q/RG: ${RRNODEST})

; end of [ext-findmefollow]