I posted this in 2018 here and it was marked as status-deferred. It's almost three years later and this is still an issue on Gardening and Landscaping and any site where photos are used to help answer questions
The real issue with image uploading that I see all the time on SE sites where users are not technically savvy is that the size limit of 2 MB is a barrier to asking questions. Most people use cell phones to take pictures and many cannot figure out how to reduce the resolution so the picture will not exceed the size limit.
Your image is too large to upload (over 2 MB).
Instead of showing a message that your picture could not be uploaded just show a message that your picture is being resized and automatically resize it.