This feature would be fantastic for creating a modular environment. The passing of parameters between flows and essentially creating the ability to make functions would make flows an irreplacable asset to my work.
We are now working on this and will release it in the next couple of months.
I am also interested in an update. We're coming up on two months since the message that "Yes this will be available within the next month.", and the 2/1/2020 cut over of the HTTP webhook to premium is coming up fast.
This is about to be marked as completed based on the announcement from yesterday:
I would argue that this does not meet the needs of the community because of the crazy limitations of the Solutions architecture. Almost all of our process automations use SharePoint and since Solutions doesn't support Flows that connect to SharePoint, this is yet another feature provides us almost no value.
@Stephen If you want people to adopt Solutions and subsequently use these new features, I would recommend you find a way to remove the limitations currently imposed on Solutions. Otherwise you'll end up with people spinning up yet another suggestion to implement this feature but in a way that meets the needs of the community (similar to what happened with this idea for organizing Flows).