Select Inventory from the hamburger menu.

Select any Inventory Item and you will see the description of that inventory item.

You will see Item Image section on the screen with + icon.

Clicking on + icon will open a form with all details filled, here you can add the images by selecting the + in Add Image(s) section.

After selection of the image that you want to add, Select Update button at the bottom of the form.

Selecting Update button will open a succcess alert.

Success alert means images to the inventory item has been added successfully.