Android Preview SDK

Hi, I am trying to use box-android-preview-sdk, but I can't find any other way to display my files except using BoxPreviewActivity which pretty much handles everything yet my business case implies that I display the file inside an overlay which means I need to preview the selected file on a fragment not an activity.

What I am trying to do is to display the files using fragments on our application, but this is not possible through the SDK, or so I would think but I can't be sure because there is not enough documentation about this.

Is there any way that I can display the files on a fragment or not? I see that there is BoxPreviewFragment but I could not use it. Or is the only way to preview is using BoxPreviewActivity?

Another thing, we are displaying files that are stored on Box CMS, I already use BoxShareApi and pass the sharedLink to get the BoxItem so that I can use it with the preview SDK yet I always get the following error from the Preview SDK that the file is not found although I already got all its info using BoxShareApi

{"type":"error","status":404,"code":"not_found","context_info":{"errors":[{"reason":"invalid_parameter","name":"item","message":"Invalid value 'f_157150080898'. 'item' with value 'f_157150080898' not found"}]},"help_url":"http:\/\/developers.box.com\/docs\/#errors","message":"Not Found","request_id":"***number removed for privacy***458fe9dce896a7"}

We tried this approach with Box IOS Preview SDK and it works just fine, I just don't understand what am I missing from Android side? Is there a limitation in the android preview SDK that does not allow me to preview files on CMS unless I at least have collaborator access to it?