group share api publishpackage

post /api/projectserver/v2/projects/{projectId}/publishpackage

Implementation Notes

In order to publish a project, a POST request needs to be made to http://%HOST%/projectserver/api/1.0/projects/[projectid]/publishpackage?callbackUrl=[url] including the Studio package in the request's body as multipart/form-data content. The callbackUrl parameter can be omitted. The 201 Created status returned means that the publishing task was queued successfully, not that the project was created.

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but what is the package's format ? 

a dir or which type of file?