Still on GlobaLeaks i was trying to include Fusty-flow in order to provide browser compatibility to IE9.
I managed to integrate fustyflow with ngflow simply including the library following https://github.com/flowjs/ng-flow#how-can-i-support-older-browsers
Then i tried uploading a file and the client appeared to upload successfully but on the backend i found that the flowTotalSize was missing in the request.
From this i'm supposing that the API is different and should be documented or maybe it is a bug and it should be fixed.