QB Issue Resolution:
Please follow the instructions provided on this article on how to import QB desktop file to QB Online. See this link:https://qboe.custhelp.com/app/answers/detail/a_id/6011/related/1/kw/convert%20to%20new%20quickbooks%…
Resolution for Issue 'How do I import a QuickBooks file from QuickBooks 2012?' available: Yes (Solved).
Source: Intuit Community forum.
How do I import a QuickBooks file from QuickBooks 2012?: 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]
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