It is not possible to crop images in Concepts at the moment, but it is something we'd like to add in the future. Generally, we recommend cropping your images before importing them onto your canvas.

An alternative to cropping is to use the Hard Mask tool to mask out parts of imported images.
* Note that this doesn't erase the parts, it is essentially hiding or covering areas. 

If you later move the images you will also have to select the mask strokes to keep parts of the image hidden. To make selecting easier, it's a good idea to group the image with the mask strokes.

You can learn more about how to use the masking tools as a cropping alternative and what to expect in our Walkthrough Series.