Photo gets lost when saving another value

Hi,

I have a field called 'Car Photo' of type 'file' used for uploading a photo on the account form

I have a field called 'Role' of type 'select' used for choosing a value to set on the account form

 If I upload a photo and Save that works fine

Then later choose a 'Role' value and Save

Both the photo image file and Role values are removed.

Can you advise?

Thanks

Dave