Sounds great, looking forward to trying the upgraded File Uploader!
I ran into the following problem after upgrading to 0.57.0:
AttributeError: ‘Server’ object has no attribute ‘_session_infos’
But was able to fix it by updating to a newer SessionState gist: https://gist.github.com/tvst/036da038ab3e999a64497f42de966a92
Just posting this in case anyone else experiences the same issue.