Advertising API - How do you supply the Logos for ResponsiveAd objects (in order to create a multimedia ad)?

In order to create a ResponsiveAd Data Object (for use as a multimedia ad), we must supply "multimedia ad images" and "multimedia ad logos". According to the following article, this is done by creating "multiple image assets" for the Multimedia ad images, and "multiple logo assets" for the Multimedia ad logos.

https://video2.skills-academy.com/en-us/advertising/campaign-management-service/responsivead?view=bingads-13

However, there is no such object as a "logo asset". An asset can be an ImageAsset, a TextAsset, or a VideoAsset

https://video2.skills-academy.com/en-us/advertising/campaign-management-service/asset?view=bingads-13

ImageAsset objects have a SubType element, but the documentation at the first link above specifies that the Multimedia ad images and the Multimedia ad logos have the exact same SubType, so that element does not differentiate them.

Additionally, the Elements of the ResponsiveAd have only an "Images" element to supply Assets. So theoretically, the "multiple image assets" and the "multiple logo assets" all have to be supplied via the "Images" element, but there is no way to designate a differentiation between the two.

So how do we accomplish supplying the two very different types of ImageAsset objects?