a!fileUploadField( label: "File Upload", labelPosition: "ABOVE", target: cons!TI_SAVEDFOLDER_CONSTANT, fileNames: "Test1", maxSelections: 1, saveInto: local!file
)
use above code to upload file in folder inside Appian using constant.
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The other application need to be integrated with the Appian via webservices to exchange files between two systems.