It’s not really clear what to do with multi-species observations. Here’s what I think (@tiwane, correct me, please!) identifiers are supposed to do:
Make a comment alerting the observer that there’s a problem. I say this (the Spanish is copied from Jason Hernandez): “It appears that you have included several species here. iNat is only set up to identify one species per observation, so you will need to split these up. Here is how to do that: https://forum.inaturalist.org/t/how-to-fix-your-observation-with-photos-of-multiple-species/15096. Parece que tu observación contiene várias especies. iNatualist solo puede tratar de una especie por observación, entonces tienes que separarlas. Aqui hay direciones: https://forum.inaturalist.org/t/como-arreglar-tus-observaciones-con-fotos-de-multiples-especies/24540.”
Wait to see if the observer responds. I generally allow a month for this.
If the observer doesn’t fix the observation, then ID it at the lowest taxon that works for all the observations, which could be Dicots, Insects, Animals, Life, etc.
If another identifier comes along and agrees with that ID and if someone marks the DGA as good as it can be, then the observation goes to Casual.
One way to speed this up is if the original identifier not only alerts the observer, but also IDs it at the lowest taxon possible for all of the photos. Then the second identifier can just agree (assuming they do) and mark it as good as can be.