Question

How to export files using file source name from UiPath?

Answer

1. Create a Service Field in the Document Definition and name it for example as "ImageSource":
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2. Open field's properties and in the tab Data Source select Source: Image Source:
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3. Open Export profile settings in the Document Definition.
4. Set Filename template as <RegParam:ImageSource>:
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5. Save and publish Document Definition.
6. Open Workflow settings for the Project or BatchType (depends on what is used). 
7. Set it as an Advanced workflow scheme and right before Export Stage create Automatic stage (Create Processing Stage > Automatic > OK).
8. Open stage properties and then Script tab.
9. Select Type: Document Processing and click Edit Script…
10. In the script editor select C# .Net language and put the following script:

using System.IO;
string s = Document.Field("Invoice Layout\\ImageSource").Value.ToString();
s = Path.GetFileNameWithoutExtension(s);
Document.Properties.Set("ImageSource", s);

string s = Document.Field("Invoice Layout\\ImageSource").Value.ToString();

The script will take the ImageSource value from the Service field and then will set the registration parameter for the document with the value of the field. At the Export stage, the value of the registration parameter will be used to name exported file.