If you can see the file in your browser window, you should be able to upload it. However, some operating
systems will refuse to let an already open file be manipulated by another application. If this is the
case, you should get an error message when you try to upload it, perhaps even interpretable message.
Generally, you would have to close the window of the file in the other application. Erroneous processing
of the file could be due to a number of things.
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If you tried to upload a binary file (such as a native-format Excel file, it would be misread by
the parsing script and produce gibberish).
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If you confused the stated field delimiters with the actual delimiters. For example, if you saved
your data delimited by COMMAS and indicated that it was TAB delimited (or more usually, didn't change the
default delimiter from WHITESPACE.
If this happens, R will complain about mismatched vector lengths.
This has often proved to be the case with users of Macs and PCs where many applications allow the
embedding of spaces in the label field. It's always a good idea to replace spaces with underscores (_) in
these cases.
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If you numbered the columns starting at ONE instead of at ZERO.