QB Issue Resolution:
attachments are not imported to QBO
you could check the app store for a utility, but I doubt it
Resolution for Issue 'Is it possible to import you attached documents from your Quickbooks 2013 Accountant to Quickbooks Online Accountant?' available: Yes (Solved).
Source: Intuit Community forum.
Is it possible to import you attached documents from your Quickbooks 2013 Accountant to Quickbooks Online Accountant?: 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 Import
Quickbooks Repair Pro will resolve it efficiently and affordably. Guaranteed resolution of your issue, or you pay nothing!
Error Recovery for Import [Canada]
E-Tech is the #1 Quickbooks data migration and Conversion service provider.
Additional Support Options: