Thanks for revisiting the thread, Skotty. I'll share an overview of attachments in QBO and then connect you with the appropriate support team to investigate your concern further. 

In QuickBooks Online (QBO), once you upload an attachment to your invoices or estimates, it remains accessible in your transactions. There's no need to change any settings to keep them indefinitely. You may check the Attachments folder to verify if your missing photos/files are stored there. Please refer to the steps below:

1. Go to Settings.
2. Select Attachments.
   
   
   
   
3. Locate your missing photos/files. If the image is linked to a specific transaction, it will be indicated in the Links column.
   
   
   

Additionally, the maximum file size for attachments is 20 MB. Check out this article for more information: Add or delete attachments in QuickBooks Online.

If the photos are still missing, I suggest contacting our Customer Support Team. They have the tools to access your account, trace the root cause of why your data disappears after a certain period, and provide a resolution.

1. Sign in to your QuickBooks Online (QBO) company.
2. Click the Help button.
3. Hover to the Search tab, then select Contact Us.
4. Type in a brief description of your issue.
5. You have the option to choose Callback to request a return phone call.

Support Hours is available for Plus, Essentials, Simple Start M-F 6 AM to 6 PM PT and Saturday 6 AM to 3 PM PT.

For Advanced, any time, any day.

I'll be around if you have additional questions about managing your invoices. Skotty.