I am unable to save product images with only some products. I have tried in another browser & in an incognito tab without luck. Any suggestions?

Thank you, Nhillborn, for taking the time to try different troubleshooting steps and sharing your insights with us. 

This issue may be caused by the file format or a huge file size. Ensure the file is in the correct format. Below are the acceptable file formats in QuickBooks Online (QBO). 

• gif, bmp, png, jpg, jpe, jpeg.
• File size: smaller than 10 MB.
• Bit depth: 24 bits or less (or color depth.
• Image shape: square-shaped (rectangles do not work using the standard RGB color space).
  
  

Also, If your image is CMYK-formatted, convert it into an RGB image using tools (such as Adobe Photoshop) before uploading it to QuickBooks Online. 

For more details, you can refer to this following link: Run reports by class for products and services. 

You can also check out this article and learn how to categorize income transactions in QBO. 

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Let me know if you need more information about attaching images on invoices in QBO. We're always here to assist.