2. Changing field settings

After image fields are converted to file fields, you have to update the fields’ configuration.

Field configuration

Widget

For each content type that contains the file field that you use to attach images, Go to the 'Manage field' tab of content types (admin/structure/types/manage/[field's machine name]/fields). By default, these fields’ widget is set to ‘file’.

If you wish to use the Media module’s media browser, you need to change this to ‘Media browser’. You may also want to go into each field’s configuration and specify which media types the widget should handle (audio, document, image and video). This can be configured globally, as well as per field.

Field formatter

File field’s field formatter does not give you an option to display the attached images using the Image module’s presets. In order to workaround this issue, you need to install and enable the Image Preset module.
Once the module has been enabled, you can choose which preset to use in the formatter configuration page.