If a type has the setting "Author can delete" = "No", he should also not be able to delete already uploaded files.
Or, if we consider deleting uploaded files as "editing", than there should be a setting in the "upload field" parameter to choose "Delete uploaded files" = Yes/No.
If a type has the setting "Author can delete" = "No", he should also not be able to delete already uploaded files.
Or, if we consider deleting uploaded files as "editing", than there should be a setting in the "upload field" parameter to choose "Delete uploaded files" = Yes/No.