Expose ref for <input type="file"> element

[justrhysism]

Is your feature request related to a problem? Please describe.
Currently, it's not possible to get the ref for the underlying <input> element which makes this library difficult to use with libraries like "react-hook-form".

Describe the solution you'd like
Expose a prop inputRef so the author can provide their own ref.

Describe alternatives you've considered
Hacky solutions of traversing the DOM 😢

Additional context
N/A

[rikschennink]

FilePond generates a custom list of input elements to store its data, the elements are removed when files are deleted, not sure how that would work with a ref

[bishnu-47]

how to get the file inside onSubmit then?

[rikschennink]

get a ref to FilePond component and call getFiles() on the FilePond instance in the ref.

[CestDiego]

I'm having an issue with this too because, even though we can submit by just querying the data. Now we don't get the awesome type checking that comes from using react-hook-form with a validator.

Regardless, thanks for working on this :D.

[rikschennink]

@CestDiego good point, I believe with the way I set up FilePond v5 this is addressed, so should be better in the future.