Hello John,
We can only add the PDF file type as attachments in QuickBooks Online. The following file types are the recommended ones when uploading logos:
- .GIF
- .BMP
- .PNG
- .JPG
- .JPE
- .JPEG
Aside from the file types, there are other factors that you'l want to consider when uploading a logo. You can check out this article for more information: How to Add, Customize, and Troubleshoot Logo on Sales Forms.
Feel free to let me know if you need more help with this.
