Thanks for getting back to us and providing additional details to your concerns, Suzanne181. 

I can help share some insights about your lost attachments. When you move from QuickBooks Desktop to the Online version, there are limitations on what data won't convert to QBO. One of these limitations is Attachments. For more information, please check on what to expect when you switch from QuickBooks Desktop to QuickBooks Online.

You may need to attach them again manually into QuickBooks. 

Answers to frequently asked questions about QuickBooks Document can be found in this article: QuickBooks Document Center: FAQs and common issues.

Please reach back out to me if you have any additional questions about migrating your data between QuickBooks. I'll be right here to help.