Why digital sells well from TikTok
A digital product has no stock and no shipping: you make it once and sell it as many times as you like. TikTok brings the audience and the video demo, and all that is missing is a clean place to take the money and hand over the file. That is what your link page is for.
The trap to avoid: selling by hand, DMing the file to each buyer. It burns hours, it invites mistakes, and it falls apart the moment a video lands and several people buy at once.

