Fixes file uploader showing invalid file modal just one time

[kart-u]

Summary

Closes #5521
Due to the file input not being reset in Uploader.vue, the modal exhibited buggy behavior where a alert modal for particular invalid file would only appear once when doing consecutive upload for the same file.
This has been fixed by adding a resetFileInput() call on KModal submit

References

bandicam.2025-11-06.03-41-14-269.mp4

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Reviewer guidance

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[MisRob]

Hi @kart-u, thanks for another contribution! We will assign a reviewer.

I've just merged your other #5522 - could you rebase this PR on top of the latest unstable so we can see the new diff only?

[kart-u]

@MisRob I have rebased the branch onto the current unstable as you requested.

On a side note, I’m currently deepening my understanding of the codebase, so if there are any medium to hard issues in future, please consider me for them I’d love to contribute 😊

[MisRob]

Thanks @kart-u, occasionally there is a gap like now, but typically few new 'help wanted' issues of various complexity are added each week, so you can keep an eye on the list.

[AlexVelezLl]

Thanks a lot @kart-u! This seems to be the right solution! However, it may be a bit tedious to maintain those different calls to the resetFileInput method, and if, for some reason, in the future, we have another modal, or if we add a @close event handler, we may forget to make this call to reset the input ref value.

What if we reset the fileUpload ref value after processing the files within the handleFiles method? That would make the solution a bit more flexible? Would like to know your thoughts!

[kart-u]

@AlexVelezLl Sorry for the late reply I have exams going on, so my time was split. I also believe adding a reset in handleFiles is a better approach. I’ve updated the changes,please review.