Problems with communication between scope and uploader

[robrobsen16]

hi
i integrated your uploader in my site. the upload function works fine.
but if i choose a file, the buttons doesn't change to replace file and if a start the upload, the progress bar is only grey with no progress.
the files are uploading into the bucket well. the post and the answer is correct.
but in the frontend, i dont have any changes (no success info and so on...)
any ideas?

thank you
julian