> ## Documentation Index > Fetch the complete documentation index at: https://docs.abbyy.com/llms.txt > Use this file to discover all available pages before exploring further. # Use Skill activity > Use Skill activity creates an ABBYY Vantage transaction from input files and returns a Transaction Id for downstream UiPath connector activities. **Use Skill** is typically the first Vantage activity in a UiPath workflow: it submits a document to a Vantage skill and hands back a **Transaction Id**. Processing happens asynchronously inside Vantage — you pass the Transaction Id to the **Get Results** activity to fetch the results once processing finishes. ## Activity properties | Group | Property | Type | Description | | ------------------- | ----------------------------------- | --------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | | Connection Settings | Skill Name | `String` | The name of the Vantage skill. | | Input | Input Files | `IReadOnlyDictionary` | A Dictionary collection, where `String` is the name of the file and `InputFile` is the class describing the input file. Before adding files to the dictionary, it is necessary to ensure that non-repeating values are passed to the `String` parameter. You cannot add more than one file to the Input Files dictionary for which the same name will be passed in the `String` parameter. | | Input | Transaction Registration Parameters | `IReadOnlyDictionary` | A Dictionary collection of transaction registration parameters to pass the key and value of each parameter. | | Output | Transaction Id | `Guid` | The identifier of the created transaction. This ID is then used as the **Transaction Id** input property of the **Get Results** activity to get the status of the transaction and the processing results. | ### InputFile | Name | Type | Description | | --------------------------------------- | ------------------------------------ | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | fileStream | `Stream` | The contents of the file that will be passed to ABBYY Vantage. You can pass the stream of the file on a local disk as a value of this property (e.g. `System.IO.File.OpenRead("D:\images\Invoice1.pdf")`). | | index *(optional)* | `Integer` | The index number of the file in the transaction. | | fileRegistrationParameters *(optional)* | `IReadOnlyDictionary` | A Dictionary collection of file registration parameters to pass the key and value of each parameter. | The Use Skill activity can only be used inside a configured Vantage Scope activity. When configuring the activity, set the **Password** or **Client Secret** property on the Vantage Scope activity (depending on your authentication flow) so the connector can retrieve the skill list. Switch to the **Secure Password** or **Secure Client Secret** property once your workflow is configured — see [Vantage Scope activity](/vantage/connectors/uipath/activities/vantage-scope). Vantage Scope activity UI Click the button to the right of the drop-down list under **Skill Name** to load the list of skills. Then expand the **Skill Name** drop-down list and select the skill you intend to use for document processing. We recommend reducing the file size of big files to 30 MB or less to speed up document processing. The **Skill Name** parameter accepts a UiPath `String` variable. Selecting a skill from the drop-down writes the new value to the variable. Expressions and references to other variables are not supported. ## Related topics Pass ABBYY Vantage connection settings to nested Vantage activities. Retrieve the processing results from ABBYY Vantage. Save extracted field values to UiPath variables.