Running EE 2.4.0, using the Safecracker File upload fieldtype, files that exceed the maximum file size limit for the designated folder’s file upload preferences do not prompt an error in either the CP or via Safecracker form submit. They do not upload, but also do not throw an error. Files that are within the upload limits successfully upload. For what it’s worth, our PHP memory limit is 128MB. The folder is set with correct permissions and you can upload if obeying the maximum file size limit. Not throwing the error is creating a problem with our Safecracker forms, as users are not notified that they submitted a file that was too big.