When you use filebrowser to upload a file that is bigger than the on the server, it fails without a visible notice to the user.
Upload a file that is bigger than the memory_limit in any filebrowser field
There should be a Drupal::message()->warning that tells the user that the file he tried to upload exceeds the maximum size limit.
" An AJAX HTTP error occurred. HTTP Result Code: 200 Debugging information follows. Path: /filebrowser/action/upload/ajax/4716?element_parents=u_file&_wrapper_format=drupal_ajax&ajax_form=1 StatusText: parsererror ResponseText: Warning: POST Content-Length of 284869112 bytes exceeds the limit of 104857600 bytes in Unknown on line 0
...
An unrecoverable error occurred. The uploaded file likely exceeded the maximum file size (100 MB) that this server supports.\n \u003C\/div\u003E\n\u003C\/div\u003E\n","settings":null}]"
" An AJAX HTTP error occurred. HTTP Result Code: 503 Debugging information follows. Path: /filebrowser/action/upload/ajax/4716?element_parents=u_file&_wrapper_format=drupal_ajax&ajax_form=1 StatusText: Service Unavailable ResponseText: 413 Request Entity Too Large 413 Request Entity Too Large nginx "
Closed: works as designed
3.0
Miscellaneous
I am not able to replicate this.
Take a look at attached screenshot.
Drupal will handle this and I just checked it and it works file.
Can you have another look and provide more info?