In this doc, it is mentioned that
The following features aren't yet supported in the Developer Preview.
... ...
Publishing add-ins to the Office Store or Office 365 centralized deployment that use custom functions.
I just want to make sure it means that at the moment we cannot submit to Office Store any add-in that has custom functions; what we can do is only internally deploying add-ins with custom functions, right?
Deployment via the Office 365 Admin Portal and AppSource are not yet enabled.
is still there. So today developers still can NOT submit add-ins with custom functions? – Neuburger