QB Issue Resolution:

The option Email Batch only sends the transaction itself. If you wish to email your transactions together with the attached files, attaching the files manually within the send forms window is needed.

  • Go to File menu> Send Forms> Click the Clip icon (attach icon) to attach the documents to each forms

Resolution for Issue 'how do i send attachments along with the invoices when i send a Batch of invoices?' available: Yes (Solved).
Source: Intuit Community forum.

how do i send attachments along with the invoices when i send a Batch of invoices?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for attached files
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Error Recovery for attached files [Canada]
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