how do I change an image size
I am trying to upload an image file onto an application. It cannot exceed 4.2 MB. My jpeg image file is 213 KB.
MacBook Air 11″, macOS 12.7
213KB (213,000) is way way smaller then your limit of 4.2MB (4,200,000,000)
Perhaps there is another problem. By upload, are you meaning that you are using a web browser, like Safari? Or something else. What sort of image file is it? Is it jpg? What sort of error message do you get?