To integrate Google Conversion Tracking I would like to overwrite ReceivedFormSubmission.ss which is located im cms/templates/. If I place a file with the same name in mysite/templates/ or themes/mytheme/templates/Layouts it doesn't get used by SilverStripe.
Will I have to overwrite a original SilverStripe file which might be updated upstream later?
I have a project where I need to upload text content to some pages of an unfinished site, while developing the rest of it. My concern is that when i update the site, will I overwrite all my content. Is there a way I can prevent this?