If you have set a max upload image size in the Site Configuration, File Manager settings AND your server doesn't load the php fileinfo module, the upload WILL fail. The fix will be in the next patch/release.
Two work-arounds:
Remove the max size setting (zero or empty) in the File Manager Site Configuration
Add to your server php.ini to load the php_fileinfo module
If you have set a max upload image size in the Site Configuration, File Manager settings AND your server doesn't load the php fileinfo module, the upload WILL fail. The fix will be in the next patch/release.
Two work-arounds: