Where are uploaded files stored? Change folder on upload possible?

[hilburger]

Hi there!

I'd like to ask the folling question which I can't solve after looking around:

1. Where are the files uploaded via the poll's/post's upload-button stored? When creating a post the are saved in the top folder "Files from the stream". But nothing can be found there uploading a file to a poll using the upload button.
2. Is it possible to choose the upload target folder?
3. Can the default upload folder (if any) be changed?

Thanks a lot - awesome work!