I've tried testing this in a single server (non app service) environment. When I run the "Delete old temporary upload files" task, I do see the FormFileUploader folder being cleared out on the CMS site but never the MVC site. No matter how I configure the delete task, I can't get it to execute on the MVC site. Is it just not meant to run on the MVC site?
If that's the case, how is this folder ever cleared out? Is the folder supposed to be synced with the CMS site?
It seems possible for users to not complete their forms and have their files stuck on the server (eventually building up over time). I would imagine others have run into this, unless something isn't configured right in our Kentico instance.