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I have a form which has a FileField among other fields. Imagine the user chooses a file, presses submit and another field triggers a ValidationError.
When I get back the form, with the errors on the page, what the user chose for the file field is gone. Can I make it appear, or is this a browser thing?
This is a browser thing – for security reasons, you can’t prepopulate a file input, otherwise it would be easy to trick users into uploading files from their system without their explicit action.