Here are all related files:
I didn’t upload the simplemde.min.js, because its an official js file.
The locations of the files in the deployed webapp are:
sample-form.html: located in the external process application and referenced as a startform for a bpmn process
So please have a look on the files, if something is wrong or missing
PS: I had to convert them to txt, because it’s not allowed to upload html or js files.