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What do you want to do with the uploaded file?

You can insert links in a text cell and refer to a relative path like 'data/myfile.txt' where 'myfile.txt' is the uploaded file.

Or do you want to use code stored in that file, look at:

http://ask.sagemath.org/question/2170/how-to-use-a-worksheet-content-in-another#3082