It's time to discover this Offline mode for Power Apps model-driven app tutorial, that could be very useful is you've planned to work on such a use case.
What about having an efficient communication between users, you could use Dynamics 365 InApp Notification to interact with user without disturbing them and keep a nice overviews of your tasks.
Here is an article that answers the simple question: PowerApps Portal: Tutorial How to create a portal? Come and discover the tips around this subject!
After the 2021 Microsoft Power Platform release wave 2 Task Flow to change login password for portal contact was retired. Let's see here how to change PowerApps Portal login password by using JavaScript.
Microsoft Power Fx is the name given to the language used in Formulas in Canvas Apps. Microsoft is investing in this language to make it not only available in the formulas of Canvas Apps, but in several other places too. Today, we take a Microsoft Power Fx Overview on this new features ! And they look very promising !
Power Apps Portal Web Files with Azure Blob Storage is an article that explains how to use Blobs to store your web files such as JavaScript for your Portal Apps dev. Enjoy.