AssetBundle instantiation in android/ios

Hi im creating one web app and one mobile app. Where in the web app i can edit some models save them as assetbundles for android or ios and then in the mobile app i can download these bundles and use them.

My 1 question is if its possible to create assebundles realtime in web app where the target platform will be android or ios?

My 2 question is how can i avoid the freeze after instantiating these bundles?

Thanks