Hello! In general extensions
- are not supported in the Cloud
- QS Desktop users have to install them as well in order to use the app
- have several bugs and/or upgrade issues
- are not supported by Qlik directly
However, in their statement of direction Qlik mentions they plan to work with partners to provide certified, enterprise ready extensions that meet all quality, security, functionality, and maintainability criteria. I also read that enabling extensions in the Cloud is coming sooner than later. Good times.