You should include an image add button because if a student was using this app/website, they would likely look for the imagery add button. Most students in high school and other courses in college have a hard time understanding their subjects or are just looking for answers for their homework.
Typically we like to think of reading images as pertaining to computer vision, where as OpenAI is more focused on the field of natural language processing - specifically to help humans get stuff done 
If you built an application that combines OpenAI’s NLP with another networks computer vision - I don’t think any highschool or college students would complain. 
It also wouldn’t be too hard!