How We Adjust Segments When Additional Files are Uploaded
Of course each unique record in your files should only be in one segment per field at a time. For example, if you're a pet supply company, you might want to group customers by gender and by whether or not they've used your pet grooming services.
So let's say you send us the following file that contains a record for Jane Doe:
EMAIL1,GENDER,GROOMINGSERVICES
Jane@gmail.com,female,false
Then in your audience there'd be a record for Jane, and she'd be in the segments "Gender=female" and "Grooming Services=false."
But if you then sent us this file:
EMAIL1,GENDER,GROOMINGSERVICES
Jane@gmail.com,female,true
We would update Jane's segments to be "gender=female" and "Grooming Services=true", so we'd be removing her from "Grooming Services=false" and placing her in "Grooming Services=true."