Thanks @Vitaly Furman by detailed instructions, but I need a sample where I receive a file uploaded by user using an REST API with formdata mode and get objectscript reference to this file. In your samples, the first refers to the documentation, thats don't have file upload sample and in the second, the sample is about a custom cache project, not about ensemble.
 

It is a docker repo. It is possible create a maven repo to the community? Steps: https://www.theserverside.com/video/How-to-set-up-and-use-a-JFrog-Artifa... or https://jfrog.com/screencast/setting-maven-repository-jfrog-artifactory-.... It allows you create many kind of public repository types, not only maven. Do you have another excellent option, but this only to maven repo https://archiva.apache.org/