save(copy) same id, _id item from a collection to a other ?

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Hi! we have connected a input dropdown connect list from a database, to save this selection in the second database. We would like that the SAME unique item _id field generated in the first collection appear in the second database in a specific field I will create.

We don’t want the relace the wix _id of the second collection. we just need to use this unique generated _id to save it in a field we will create into the second one !

thanks!