Remember that if your work incorporate the copyrighted work of another, such as a scholarly article that uses a copyrighted photograph to illustrate an idea (after having received the permission of the owner of the photograph to include it). The CC license applied by the author of the scholarly article does not apply to the photograph, only the remainder of the work.
You have to say then, that the license only concerns the text, nothing else.
Remixing is crucial when discussing Creative Commons because it aligns with the fundamental principles of openness, collaboration, and creativity that underlie the Creative Commons licensing framework. There are are several examples of why remixing is important:
Except where otherwise noted (e.g. illustrations, videos and pictures), content on this site is licensed under a CC-BY-NC-SA 4.0 license.
CC-BY-NC-SA logo created by Lucas Ehlinger, https://www.flickr.com/photos/linxa/9059283431, CC-BY-NC-SA 2.0