Tanwin introduces an n-like sound in connected reading, but that n is not retained when stopping. Even where rawm is used to hint faintly at a final vowel, the tanwin n is not pronounced.
On a word ending in damm tanwin, do not add a final n when pausing. Apply the appropriate waqf method.
Rawm is a faint indication of a vowel, not a way to preserve the tanwin consonant.