I believe you're correct. The Windows implementation of cURL may be a bit different and/or how the command prompt handles the syntax.
https://www.driftingruby.com/episodes/ruby-on-rails-development-with-microsoft-windows-10
https://www.driftingruby.com/episodes/intro-to-docker-on-windows
Check out these episodes. I'd highly recommend one of these methods if you're going to be developing on a Windows machine. Alternatively, you could also do a VirtualBox Ubuntu VM or something similar.
Can you post relevant code and also check to see if you have any JS errors in the Developer Tool Console of the browser? This should all work regardless of using `simple_form` .