To update all the templates with attached image please follow the included steps
Step 1 – Preparing Image Link
Go to Configuration → Templates → Notifications → E-mail Images tab.
Click the Add Files... button and select an image from your computer.
Find your image on the list and click on Link. This will open an image in a new browser tab.
Copy the URL from page address bar and save it – it will be useful in the later steps.
Step 2 – Adding an image to the notification
Go to Configuration → Templates → Notifications → Templates tab and select the template you wish to edit.
Click on the image icon. A window will pop up.
In URL field, paste the link you previously copied.
You can define settings such as size of the image, border, spacing and alignment.
Click the OK button to insert the image.
The image will appear in the template editor. You can also preview whole e-mail – you need to specify an item (Vendor or job, etc. depending on the type of the notification) in the field on the left first.