Hi all - I have a custom tool that can optionally take a file as input.

Right now, users have to upload the file into their history, then select
the file when running the tool.

Is there a way to let the user select a file local on their computer as
input to the tool, then when run, the file is uploaded?

And (second question), how can I make this field optional, such that the
user does not need to provide a file at all when running the tool?

Right now, my input field is:

<param name="factorSheet" type="data" label="Factor Sheet" help="Select a
factor sheet (if any)." />
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