You mean a simple YES. However that is not how this forum works, you can not even answer only Yes. I should have answered follow the forum rules FAQ - Manager Forum more specifically:
- Search before you post. Chances are good you are not the first person with a similar question. If you cannot find what you need in the Guides, thousands of topics with tens of thousands of postings make it likely the answer to your question is already here on the Forum. Before starting a new topic, tap into our huge, crowdsourced knowledge base.
Because as at per post Custom Actions - #4 by lubos the name was changed to Extensions. When you search the Forum on extensions or look at Settings then you would have noticed that this has moved to obsolete features.
This is an assumption, but it does not matter because there is no discrimation between Paid (Server Edition (like myself) & Cloud Edition (like yourself) and free Desktop Edition users as far as support is concerned and that is applaudable. Likewise support and advise in this forum comes from such variety of users and is aimed at making the software better, hence the numerous releases.
As a new user I would not advise to respond to any old topic such as this to avoid lengthy replies like this. I also would advise that you recognize that except for @Lubos we volunteer our knowledge and time to help each other on this forum and replies as “…a simple NO would have been good enough…” are not very encouraging to do so.