I have created a form using forms central for our company and i have tried using the form on my Ipad but i come to upload an image and it wont do anything,
The iOS does not allow files to be uploaded within the browser. Its not technically possible. Hopefully Apple will allow this someday.
For now our attachments fields won't work on iOS.
Do you also know if it is possible to save the file in a uneditable PDF (after it has been completed)?
You can download the response as a filled out PDF by going to the View Responses tab and right-clicking on a response. Is that what you were looking for?