Hi, the && should indeed be what is needed.What is the result if you are using this?Any error shown or just the wrong behaviour?

To filter based on subscriptions you can either add a filter on the "Read Audience" activity or ad an additional "Segmentation " activity.In the filter dialog, go to the "Explorer" tab and then drag "Subscriptions to an application" to check for a subscription 

What do you mean with "associate"?By default, using the SDK will create mobile app subscription instances.i.e. 1 user can have X mobile subscriptions an each mobile app can have Y subscribers.If a profile has multiple devices, even multiple registrations for the same app are possible.

You can define the tracking parameters in the Branding section in Application settings.You may refer to the documentation: https://experienceleague.adobe.com/docs/campaign-standard/using/administrating/application-settings/branding.html?lang=en

Hi, unfortunately you can't adjust any existing standard field.You only can add/modify custom fields for the recipient table. So you may create a "Custom Firstname" field potentially for your isse

If you already have a license on Campaign Standard, you normally have a STAGE and PROD instance.Then you could test on STAGE. If you don't have ACS, you may need to check with the Adobe Sales to get access to a demo instance.

The name contains Workflow ID + Activity Name. What you can do to find it out:open workflowopen Log and taskschoose the query task, hover over it and click the pencilthe workflow ID you can see in the table name variableactivity name at the top of the dialog

Hi,unfortunately Campaign Standard won't allow you to do so.Also there is no standard Aobe product to handle this case. You may do some customizations in Campaign Classic or AEM potentially to achieve what you are looking for.

Unfortunately there is no official way to do so.

It's indeed currently not shown in the dialog.Though if you have admin permissions, you can go to the App Setting => Options and search for lastExec to see the timestamp.