# Attachments

> Embed and extract files in PDF and PDF/A-3 with EmbeddedFile: MIME types and relationships, e-invoice XML, Attachments.GetFromFile and attachments on re-save.

- **Product:** TX Text Control .NET Server
- **Section:** Documentation
- **Kind:** Topic
- **Path:** TX Text Control .NET Server > PDF Processing > Attachments
- **Web URL:** https://docs.textcontrol.com/tx-text-control-dotnet-server/pdf/attachments/
- **LLMs URL:** https://docs.textcontrol.com/tx-text-control-dotnet-server/pdf/attachments/llms.txt
- **LLMs-Full URL:** https://docs.textcontrol.com/tx-text-control-dotnet-server/pdf/attachments/llms-full.txt

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## On This Page

- [How Attachments Work](https://docs.textcontrol.com/tx-text-control-dotnet-server/pdf/attachments/#how-attachments-work)
- [Choose the Relationship and MIME Type](https://docs.textcontrol.com/tx-text-control-dotnet-server/pdf/attachments/#choose-the-relationship-and-mime-type)
- [Attach a File to a PDF](https://docs.textcontrol.com/tx-text-control-dotnet-server/pdf/attachments/#attach-a-file-to-a-pdf)
- [Create an Electronic Invoice](https://docs.textcontrol.com/tx-text-control-dotnet-server/pdf/attachments/#create-an-electronic-invoice)
- [Extract Attachments From a PDF](https://docs.textcontrol.com/tx-text-control-dotnet-server/pdf/attachments/#extract-attachments-from-a-pdf)
- [Keep, Add and Replace Attachments](https://docs.textcontrol.com/tx-text-control-dotnet-server/pdf/attachments/#keep-add-and-replace-attachments)
- [Next Steps](https://docs.textcontrol.com/tx-text-control-dotnet-server/pdf/attachments/#next-steps)

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## Nearby

- **Previous:** [Flatten Forms](https://docs.textcontrol.com/tx-text-control-dotnet-server/pdf/forms/flatten/llms.txt)
- **Next:** [Text Extraction](https://docs.textcontrol.com/tx-text-control-dotnet-server/pdf/text-extraction/llms.txt)