I just stumbled across this gotcha and thought I’d share it for anyone else that might be bumping into it.
I’ve been working on the “File Metadata Microservice” project using glitch.com, and for the life of me could not get the “Submit” button to actually submit anything to the server. After taking a night off I looked again and saw that the example code glitch creates has a client.js file that has code that explicitly handles a form object. Thinking this suspicious, I deleted all the code in client.js, and things finally started to work as expected.
So, for everyone working on the “File Metadata Microservice” project, you might want to double check client.js if you are having any problems.