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Also, is it possible, for example, upload a large sample of users from database (or just from .csv), and run experiment only on these users? That is create manual segments and run experiments only on them.

@future-teacher-7046 @fresh-football-47124 maybe there are some workarounds to do this?

I would also like to know whether only a certain user segment can be exposed to the test rather than all users.

you can, but that data needs to be passed to the SDK