It appears that your post has been cross-posted to another site: https://gitter.im/galaxyproject/Lobby?at=5b8fb9b5ac25fd11b5e3ebe3
The idea is to upload files to Galaxy before running the workflow. Include "input" datasets in your workflow of the appropriate type to select that uploaded data at execution time. Be sure that the history with the data is the "active" history when launching. Workflows do not include a distinct function to upload local data.
Jen, Galaxy team