Unfortunately, there is no automatic striping during uploading in the writing room and renaming the filename in the Media library. I will add this as a feature request for future improvement.
I'd like to know what error are you getting when uploading images with the special characters name? I tried and haven't got any issue.
There is no error in the reading room, but I get errors in my application as imgix will encode special characters eg "image name+1.jpg" becomes image%20name%2B.jpg
Currently, the only solution to change the filename is to write your custom code for decoding on the front-end itself. It will give the required filename in your application.