Saved Segments is a central feature available across all Insider products that use the Unified Customer Database (UCD). It allows you to create reusable audience segments and apply them in the Segments or Recipients step of any campaign, depending on user reachability.

Segment Types
Saved Segments comprises three sections:
Dynamic Segments: You can set variable events and attributes and create a Dynamic Segment. Your segment will automatically be updated according to user status based on set events and attributes.
Static Segments: You can upload a data file to set your segment features and create a Static Segment. Your segment will not be updated unless you upload another data file.
First-Party Segments: You can upload a one-column set of attribute values using one operator and automatically create a segment to convert these values into users.
You can use Dynamic and Static segments in Email, Web Push, WhatsApp, SMS, and Architect products.
Make sure the attributes contributing to your segment are correct. Please check them carefully and create a support ticket for the Insider One team.