I will design a PowerApps form. I would like to put it into any channel tab. I will show the related information of the current channel from SharePoint via this PowerApps form. How can I get the channel Id and send it to the PowerApps form?
You Can't really do this dynamically very easily, but if you ware adding the form to a specific channel you could make use of URL parameters. But the issue is Teams tab doesn't support parameters currently. You could probably link the tab using website tab, to a powerapp directly and then pass in parameters to your app to achieve this but you might end up with a login prompt possibly on that website tab ( you would need to test that out).