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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
I also don't know what's wrong and didn't test any of that myself, but to add to the comment by /u/Scalytor I would also suggest having a look at https://github.com/OokTech/TW5-Bob which has better integration with the file system and what is in the browser as it tries to solve it somewhat “ Two-way real-time syncing between the browser and file system”. This would improve the reliability between the two machines, and what has changed on the file system to be reflected in the browser.