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Combines up to eight PDFs into a single document, in the order of the numbered inputs.

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Inputs

By default the merged PDF gets a bookmark for each source document (Document 1, Document 2, …) so readers can jump between them. No page is inserted. To merge without bookmarks, set Options (JSON) to {"tableOfContents":{"enabled":false}}.
The action takes eight discrete inputs rather than a list, so a flow can merge at most eight files in one call and must know at design time which slots it fills. See merging a variable number of files.

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Outputs

Identical in shape to any other file-returning action: File Name, File Content Type and File Content, or a JSON object with result.file.URL and metadata.pageCount when Accept is application/json.

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Example flow

Merge a cover sheet with a generated report and email the result.
1

Get file content using path — cover sheet

SharePoint. Point at a fixed cover.pdf in a templates library.
2

Get file content — report

SharePoint or OneDrive, pointing at the report produced earlier in the flow.
3

Merge PDF Documents

Nitro. File 1 → the cover sheet’s File Content. File 2 → the report’s File Content. Leave File 3 to File 8 empty.
4

Send an email (V2)

Outlook. Add an attachment: Name report.pdf, Content → the Nitro step’s File Content.
Page order follows the input numbers, not the order you filled the fields in the designer. If the output pages come out in the wrong order, check which slot each file is in.