How to send QuickBooks invoices and attachments to AP portals as a single PDF

Accounts payable portals such as Coupa, SAP Ariba, Tipalti, Tradeshift, Bill.com and OpenInvoice accept the invoice PDF and reject, or quietly drop, the signed work order, timesheet, signed PO, lien waiver or progress photos attached to it.

How do I attach a PDF to a QuickBooks Online invoice?

To attach the invoice PDF to every emailed QuickBooks Online invoice, open Settings, then Account and settings, then Sales, edit Online delivery and tick PDF Attached. To attach an extra file such as a receipt or signed work order to one invoice, open the invoice, scroll to Attachments, upload the file and save; Intuit's attachments help article lists PDF, JPEG, PNG, DOC, XLSX, CSV, TIFF, GIF and XML as supported types. The customer receives the invoice PDF and each attachment as separate files.

Why do AP portals reject invoice attachments?

Most AP portals parse one PDF per invoice for line items, totals, tax and PO match, so extra attached files either confuse the OCR, break the approval workflow, or get stripped out entirely. Some portals only expose a single "invoice" upload field at all.

The practical effect: anything you wanted to send alongside the invoice (proof of delivery, signed work orders, project photos, time logs, lien releases) has to live inside the invoice PDF itself, not as a separate file.

Why doesn't QuickBooks Online merge attachments natively?

QuickBooks Online emails the invoice PDF and each attachment as separate files, and has no built-in option to combine them into one document before sending. The recipient gets one PDF (the invoice) plus N attachments in their inbox.

There's no built-in option to combine the invoice PDF with its attachments into a single file before sending. Intuit's own community threads confirm this, and the workaround they recommend is essentially "create a single PDF yourself, outside QuickBooks."

What does the manual workaround cost?

Merging a QuickBooks invoice with its attachments manually costs about five minutes per invoice in the best case and twenty minutes plus a follow-up email when the portal rejects the file. A typical "consolidate and send" workflow looks like this:

1. Open the invoice in QuickBooks Online.
2. Download the invoice PDF.
3. Download every attachment one by one.
4. Open a PDF tool like Adobe Acrobat, Smallpdf, ILovePDF, or Preview on Mac.
5. Drag in the files in the right order.
6. Save the merged PDF with a filename the customer's portal will accept.
7. Log into the customer's AP portal.
8. Upload the merged PDF, match to the PO, fill out portal-specific fields, and submit.

Best case: about five minutes per invoice. Worst case, when the AP portal rejects the file, the size is too large, or the attachments are in the wrong format, it's twenty minutes plus a follow-up email to the customer.

How does Paidnice consolidate invoices and attachments automatically?

Paidnice picks up each approved QuickBooks Online invoice, merges the invoice PDF and every attachment into one PDF, and emails it from your own domain to the customer's AP contact or portal address. Paidnice is accounts receivable automation that sits on top of QuickBooks Online. It handles reminders, statements, late fees, and (relevant here) automatic invoice delivery with attachment consolidation.

When the feature is turned on, here's what happens every time you create and approve an invoice in QuickBooks:

1. Paidnice picks up the new invoice from QuickBooks Online
2. It pulls the invoice PDF and every attached file
3. It merges them into a single PDF: invoice first, attachments after, in the order they sit on the invoice in QuickBooks
4. It sends the consolidated PDF from your domain to your customer's AP contact or portal email

How do you set up consolidated invoice PDFs in Paidnice?

Consolidated sending in Paidnice is set up inside one invoice reminder policy in about five minutes:

1. Create a new invoice reminder policy in Paidnice (or open an existing one).
2. Set the trigger to "send on issue date." This fires the moment you mark the invoice as approved or sent in QuickBooks Online.
3. Choose the "Invoice Issued" email template. This is what your customer receives in the body of the email; the consolidated PDF is attached.
4. Enable both "Send invoice PDF" and "Send attachments." This tells Paidnice to pull both out of QuickBooks.
5. Toggle on "Consolidate into single PDF." This is the option that merges everything before the email goes out.

Save the policy. From that point forward, any new invoice issued in QuickBooks Online that matches this policy's customer or invoice criteria gets sent as a single, merged PDF.

Most teams scope the policy to the customers who require AP portal submission, using customer groups or invoice tags, and leave their standard workflow alone for everyone else.

If you want a walkthrough with screenshots, the Paidnice help center has the full step-by-step, or you can book a 20-minute setup call and a specialist will configure it with you live.

What else are consolidated invoice PDFs used for?

Beyond AP portals, a merged invoice PDF solves the same missing-documentation problem in construction, law firms, wholesale, property management, government supply and audit archiving:

• Construction and trades. Bundling signed timesheets, lien waivers, and progress photos with the invoice, so the project manager doesn't reject it for missing documentation.
• Professional services and law firms. Sending the invoice plus a detailed time and billing breakdown as one document, so accounts payable doesn't lose the supporting detail.
• Wholesale and distribution. Pairing the invoice with proof of delivery, BOL, or signed receiving dockets.
• Property management. Bundling the invoice with utility statements, maintenance receipts, or work orders for owner billbacks.
• Government and large-corporate suppliers. Meeting strict "one document per submission" rules without manual prep.
• Archive and audit. Keeping the invoice and its supporting documents stored as a single file your accountant can pull up in one click.

Frequently asked questions

The questions QuickBooks Online users ask most about consolidated invoice PDFs.

Does this work with QuickBooks Desktop too, or QuickBooks Online only? Paidnice integrates with QuickBooks Online. The same consolidation feature also works on Xero, and the setup is identical.

What attachment file types are supported? PDFs, JPEG, and PNG merge directly. Other common formats attached to QuickBooks invoices are converted before being merged.

Does the customer receive one PDF or a zipped folder? One PDF. The invoice is the first page; attachments follow in the order they sit on the invoice in QuickBooks.

Will this break my existing QuickBooks email-send workflow? No. Paidnice can either replace QuickBooks Online's default invoice email, sending from your own domain with consolidated attachments, or run alongside it for specific customer groups. You choose the scope per policy.

Can I still send invoices without attachments to other customers? Yes. Customer groups, tags, and invoice criteria let you scope the consolidation rule to only the customers who need it. Everyone else continues to receive invoices the way they always have.

Is there a size limit on the merged PDF? Keep each attached file under 5MB and the total under 10MB. If you regularly bundle very large image-heavy supporting documents, the support team can advise on compression settings.

Stop merging PDFs manually

Consolidated invoice PDFs replace the download, merge and re-upload routine on every invoice that goes to an AP portal.

Sign up for Paidnice, free with no card needed. Connect QuickBooks Online and have your first consolidated invoice sent the same day. Or book a demo and we'll walk you through it live.

About the editorial team

Written by Denym Bird Co-founder & CEO of Paidnice

Denym started Paidnice in 2022 after customers paying late left his own business short on payroll. He has led it to $1 billion collected on time across more than 1 million invoices, and writes about credit control, late fees and getting paid on Xero and QuickBooks.

Reviewed by Ashley Schroder Co-founder of Paidnice

Ashley is a co-founder and lead developer of Paidnice and has built accounting software for more than 10 years. He builds the ledger connections that put reminders, late fees and payments into Xero, QuickBooks and ERPs such as NetSuite and Business Central. Before Paidnice he co-founded A2X, ecommerce accounting software for Xero and QuickBooks.