Dropfile
Drop file command is used to upload a file from local system of user by providing the absolute file path in the parameter section.
Select DROPFILE command from the Action drop-down, select the desired Screen name, Element key and provide the absolute path of the file in the parameter section as shown below:

After completing this step, the test step will look as below:

Note: Locator for drop file command should be of attribute “input = file”.