Have you ever tried using an expanded media widget in your report for your TikTok Ads but the images showed up as blank?
If this is what you are seeing, please check if your TikTok Ads were created using a Linked method, also known as Spark Ads. You can find more information about them here. Furthermore, the "In Feed" ads do not display any images through TikTok Ads API; unfortunately, these types of ads cannot be displayed in reports.