Any image you have in the Photo Library on your device can be added to your reports in a comment.
Many people will keep an Album with images from a galley such as InterNACHI in their Camera Roll or Photo Library. You can then Add A Photo to a comment by choosing an existing photo from this Album to help clarify your comments.
The Adding Diagrams and Illustrations to Your Device article provides in depth instructions on how to upload bulk images to your iCloud Photo Library.
You can also take a look at this blog post we wrote on 3 Ways to Get Home Inspection Photos onto Your iPad for some more ideas.