So that the Community can help you better, we will need to know exactly what model printer you're using (it's usually on the top or front of the unit), any error messages you're seeing, and the Computer Operating System you're using (Windows Vista/7/8/10 or macOS 10.x), as well as the way you connect to your device (USB or networked via WiFi or Ethernet).
Any other details you'd like to give will only help the Community better understand your issue!
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Thanks for the additional information. While our forum community members are welcome to chime in, Canon does not provide direct support for imageRUNNER series products. Instead, your dealer will be able to help you! If you don't have a dealer and you're in the United States, please call us at 1-800-OK-CANON (1-800-652-2666) and we will be happy to provide you with the names of dealers in your area.
If you're outside the USA, visit http://global.canon and choose your country or region from the map for local support.
We hope this helps!
Only one scan job at a time is supported.
Multiple attachments "Bundling" is not supported via scanning, but you might be able to attach using a USB stick if supported
You cannot "stack" jobs.
Bottom line. What you are hoping to do is not supported. This is not a "deficiency" in the product. Most if not all printers do not support this functionality.