> For the complete documentation index, see [llms.txt](https://wiki.dieagenturverwaltung.de/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://wiki.dieagenturverwaltung.de/die-agenturverwaltung-en/finanzen-1/ausgangsrechnungen/attach-supplier-receipts-to-invoices.md).
# Attach supplier receipts to invoices
If external services of the cost type "billable by effort" are billed in your invoice, and there is also an original document for them - e.g. the PDF of the supplier invoice - these documents can also be attached to the PDF of the invoice in the Print Version Settings tab.
{% hint style="info" %}
**Note**
Of course, the file size of your invoice grows accordingly with the documents. If you are interested in fast performance in the invoice preview during editing, attach the documents only at the very end, just before sending.
{% endhint %}
#### Troubleshooting
In some cases, PDF files cannot be attached to the invoice; these files are then simply skipped, and the checkmark in the Print Version Settings changes accordingly.
It can help to download such documents, open them with a PDF viewer, and then print them again as PDF and upload them once more to the purchase invoice.
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