Update custom object's text field.
We have a text field in a custom object whose 'Field usage' is 'plain text' and Length of Field is 256. We need to increase the filed size to be able to store longer text. I can't see any option to change to 'Field Usage' to 'long text'. Should I delete the filed and recreate it with same name but usage as 'Long text'? I will need to backup the filed data and upload it again.
Please suggest what is the best approach.