The "Param" function DOES NOT WORK on SharePoint custom forms inside of SharePoint itself (which is where they are designed to run!!!!).   I created a form, with a custom Data Card with two label controls - one with a Text property set to "ParamValue:", and the other with the "Text" property set to: Param("Param")   Published the form, browsed to my list, and then put a "Param" query string parameter in the URL, like this:   https://<tennant>.sharepoint.com/<site>/Lists/<MyList>/AllItems.aspx?Param=Hello The customized form simply does not retrieve the param value:     Looking at the browser source when I browse to the SharePoint list, I can see that the form is embedded in an iframe.  So I mashed up a URL based in the information I found in browser source, and browsed to the customized form using a similar URL:   https://web.powerapps.com/webplayer/app?appId=/providers/Microsoft.PowerApps/apps/<AppIdGoesHer>&Param=Hello The parameter value was picked up fine:       This means that if we want to pass information to a PowerApps form from another part of SharePoint (e.g. from a page added to SharePoint or a custom Document Set page), we either have to: Browse to the form using the "web.powerapps.com", by looking at the source of the SharePoint list page to get the App ID.  This will be confusing for the user. Use JavaScript in a ScriptEditor web part to pop up the form in a SharePoint modal dialog using SharePoint's built in javascript, again using the iframe URL.   This works OK, however there's not way to close the dialog from inside PowerApps.  The only thing you can do is create a custom "Submit" button, and then browse to another screen informing the user that their item has been submitted, so that can click the "X" button on the dialog.  Again, not ideal. Having the "Param" function not work in a SharePoint custom form seems to be a big gaping hole.  Can this be fixed please? ... View more