Is it possible to get metadata (author, content) about an uploaded file?

I am using a FileViewer to extend the functionality of displaying video files. The interface provides me with a Render method, which in the parameters contains information only about the file (FileName, Path, FileStoreKey). Rendering/creation can take place in any available content (gallery media, forum-thread, forum-reply, wiki, wiki-reply, blogpost etc).

I considered using Url In-Process CurrentContext API, but using it for the blogpost-replies as an example, I cannot get the metadata about the reply itself (creator, content item), the data only contains information about the root post (blogpost).

Is there a way, based on this file data, to find out the creator of this file (userId) and also get the content item itself (contentId)?

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