So, in the RTE, if I add an image, this is shown:

But the Caption field isn't used at all.

It uses the mediacropdetails.html view, which in turn uses the MediaCropDetailsController. The controller from what I can see, does nothing with the Caption, but the view is trying to handle model.target.caption:

<div class="umb-control-group" ng-if="model.target">
     <h5>
         <localize key="@content_captionTextOptional">Caption (optional)</localize>
     </h5>
     <input type="text" class="umb-property-editor umb-textstring" ng-model="model.target.caption" />
</div>

But the only reference for a "target.caption" is in the MediaPickerController

Anyways, this can't be right, can it? =)

I'm running this on 8.18.5. (And on Cloud, but I don't think that matters :P)