Hi @jgw.gooijer Is there any relationship between 'the flow of a month' and the file names of FlowFiles those are listed by FTP and waiting at the Wait processor? If you can derive year and month from a waiting listed file name, by using Attribute Expression Language, then you can configure Wait/Notify processors to use 'year-month' value as signal identifier. This way, you don't have to close identifiers. Keep them open after 'the flow of a month' finished, so that any number of FlowFiles having the same 'year-month' can go through Wait processor. ... View more