@tagman23 

You can convert data as is from QB Desktop to QB Online. The use the trial version of QB Desktop to access your historical data including attachments for good.

is there a list of 3rd parties that provide the services to convert with attachments over to QBO?

I can assist you in finding a useful third-party application that can help you convert your attachments, kimbmoore.

QuickBooks Online (QBO) integrates with different third-party applications that can help you convert your attachments into QBO. To find the best app that matches your business needs, you can explore the App Center. However, we cannot recommend a specific app for your situation.

Here's how:

1. On the left panel, choose the Apps tab.
2. Search for a keyword or click the Browse category drop-down.
3. From there, you'll see the apps and click the app you want for you to see the key benefits.
4. Select the Get App Now button to integrate.

 If you want to learn more about the app, including contact details and support information, you can click on the app that provides services that are relevant to your business.

Additionally, I'll be sharing these articles that will guide you in managing your attachments in QuickBooks Online:

• Add or delete attachments in QuickBooks Online
• Export reports, lists, and other data from QuickBooks Online

If you require any further assistance with searching for a third-party application or attachments for QuickBooks Online, please don't hesitate to respond. I am always here to assist you.

@kimbmoore 

You can contact @Fiat Lux - ASIA to convert data with attachments.

Hi @scottrussell 

I know this is now quite a few years since you first asked this question but in case others are still looking for a solution for migrating Attachments from QuickBooks Desktop to QuickBooks Online -  I wanted to let you know that the data import and export utility fro QuickBooks called Zed Axis has been extended to provide a way to batch export attachment data from your QuickBooks Desktop company. 

This makes it possible to in migrate your attachments in batch up to QuickBooks Online.  You can check more about it in the Apps for QuickBooks Desktop marketplace

Zed