Action data v1.20.0+

The MultiUseButton allows you to use created values from previous actions. For example, you could create the content of a file with the create text action and use the data from that action as the content for the download file action.
Actions require a name to allow usage of this data.
Using the syntax $a(actionName) will replace that part with the value from the action data, if possible.
In combination with the create text action this offers some unique functionality.
Here are some examples:

Create a fully customizable XML file based on your Qlik data
Create a complex JSON body to be used in the API call action
Use the result of an API call in further actions
Create a specific text, copied directly to the clipboard

Examples

Action	Data
`API call`	Body reponse
`Create text`	Action result
`Run automation`	Automation run id (only works with `wait for execution` and automation setting `Triggered->Run asynchronously->Yes`)
`Reload app`	Last reload information (Data+ Server only)

Other text replacement options v1.25.0+

$t(index) values that are provided by the executing trigger. Except for the Data+ message, there is only one trigger value $t(1) available.

Value change -> the new value
Custom listner -> the updated defined object/value
Data+ message -> the provided parameter

$#(serverUrl) will be replaced with the current url (protocol & hostname).