Upload Content to Addressables at Runtime

I really like the idea of addressables and the feature of remote content distribution with caching and automatic retrieval. However, I still find it quite complicated and I'm not sure whether it fullfills my requirements...

I want to store the content remotely using addressables, access from two different projects / apps to the same content and I want a third application to be able to upload new 3d models so that it will sync with the other applications.

Is this possible or are you able to support this use case in the future?

It seems like the asset bundle created with addressables are bound to one build. The second problem is that the update of an early content build seems only possible using editor scripts which are not available inside any build.

I really would like to use the new system, but at the moment I'm stuck with these limitations