Got selected for DV, applied for DS 260 with the option to change status while in the US, KCCDV sent an email to check with USCIS if are eligible for change of status and if yes, pay $330 for change of status to KCCDV.

Question: Do you pay this $330 before the second letter (request for documents) comes in? or do you wait for it and once it gets processed, you send out that $330. KCCDV also says you will have to wait for your case to become current to file for change of status with USCIS.

Please help, the guidance is really weird. Anyone that has had similar experience with changing status while in the US? Also if you don't pay this $330 do they fix you up for consular processing?