Are you using Wordpress? There's a plugin called Edge Suit. Have you tried it?
Sorry I forgot to to write that. Yes I use Wordpress and Edge Suite.
I read some place about loading more than one compositions in a single page. There are some issues regarding the id "Stage" because an element is supposed to have a unique id. I'm not sure if that's the same problem you have?
You ti use Edge Suite
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Are you using the latest version of Animate CC? (2.0.1 in the About box). Just in general, multiple compositions shouldn't be a problem, because we automatically create different Composition IDs when you create a new document. You can check to see if your composition-IDs are unique in the properties panel: