> For the complete documentation index, see [llms.txt](https://docs.apica.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.apica.io/platform-docs/test-data-orchestrator-tdo/user-documentation/tdo-project-builder-user-guide/working-with-source-files.md).

# Working with Source Files

TDO uses .csv files as data sources. These files can be ingested (imported) directly into TDO, can be uploaded via API(<https://docs.apica.io/platform-docs/test-data-orchestrator-tdo/user-documentation/api-guide/data-movement-apis/ingest-upload-data-files>) or can be loaded into TDO via the Test Data Extractor (TDX) tool (<https://docs.apica.io/platform-docs/test-data-orchestrator-tdo/user-documentation/user-guide-for-tdx>).

Since the second and third methods are already covered in existing documents, this document will only cover the first method, manual ingestion.