letting file field pass through, validate other expected text fields?

hello,

hope you're well.

i'm just getting off the ground, and can't seem to find the answer to
this simple question in the docs:

i'm writing a form that allows a person to upload a file, and give
that file a title.

i'd like to 1) run form validation on the title field, making sure
it's a string, 2) leave the file content alone, keeping it simple to
retrieve, and 3) filter all extra fields, filter_extra_fields = True,
so no other rogue fields get through.

can you help? because i'm stuck on this.  and i bet it's really simple.

thanks,
kevin

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