Most people are face with this problem when trying to upload image on chrome opera mini even on mobile Apps on their phones.
Its not cause by low memory or full storage. Its an error from your phone operating system to limit process so to save memory and space for your phone not to run slow
Most solutions online are method of using Developer Options to toggle several options to try solve this problem.
I have try several method online non work for me
This solution is also Using Developer options to solve the problem but with no risk of phone misbehaving after many play around in settings.
How to Solve the Problem
1. Open Developer options
2. Toggle on "Force Activities to be Resizeable"
3. Problem Solved
If this help you give me a Thanks👍