To add an image to a Studio document follow these steps:
Click 'Pictures' on the left-hand navigation tabs.
Search and find a picture you would like to add.
Click and drag the picture onto a page in your document.
Resize and reposition the photo as needed.
Currently, it is not possible to add or upload images to Studio from external sources.
We are working on this functionality, but don't have a timeline yet as to when it will be available.