Import fails with "Error parsing file" after modifing the CSS/JS

Hi guys,

we want to customize our Rise-Learnings with some custom CSS/JS for e.g. trowing some virtual confetti when someone finished a quiz with 100% accuracy - or something like this ;-)

So this is what we are trying to do:
- Building the Rise-Course including a quiz via rise.articulate.com
- Export the course as SCORM-Package and modding the CSS/JS
- Importing the modded Scorm-Package back into Rise (ourdomain.rise.com)

Problem:
After modding the files we get an "Error parsing file" Error

Presumption:
Rise is exporting the package with an special hash which is getting calculated by the size of the exported data. If we change something on the code the package-size differs and the hash gets invalid which prevents the import - correct?

Questions:
- Is there any way to disable the hash-check?
- Is there any other way to implement custom JS/CSS-Code?
- Can we have custom templates (like maybe cloning the default theme with custom code)?

Thanks for any hint