coursePressPro - is there a size limit todata we can upload

We have the CoursePressPro and need to know if there is a limit on the data we can add to each lesson or course.

I was uploading lesson 2 for one course (there are 20 lessons in total for the course), and when I tried to add a question with a small size picture (2.6kB), I got an error message "entity too large".
Please help! I have lots of other info to load.