Your new colleague is working on a large outerwear campaign and wants to use structured data files (SDFs) to update some details. They ask you to check why they're getting an error message when they upload everything to Display & Video 360. What did your colleague probably do wrong to trigger this error?

Display & Video 360 (DV360) SDFs are designed to manage specific entity types. You cannot mix different entity types, such as line items and insertion orders, within a single SDF file. Each SDF file must be dedicated to one entity type (e.g., line items, insertion orders, campaigns, or creative assignments). Attempting to upload a file with mixed entity types will result in an error. Setting up an SDF with 100 line items in a single file is generally acceptable, as SDFs are built to handle bulk operations. Similarly, combining rows for editing and removing line items within a single line item SDF is a standard and supported functionality. Lastly, using an SDF for modifying inventory sources is a valid use case for SDFs, as there are specific SDF types for managing inventory.