Panel Plugin Dropzone in Kirby 5

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1

I have a panel plugin panel that worked fine before Kirby 5.
I’ve been using Breaking changes | Kirby CMS for updating everything to work on Kirby 5 but I can’t make the dropzone to work.

Currently my code is the following:

<k-dropzone @drop="uploadDropzone">
    <k-box
        theme="empty"
        text="Drag files here …"
        icon="file-spreadsheet"
        height="5rem"
        align="center"
    />
</k-dropzone>

uploadDropzone(files) {
    this.$refs.uploadDropzone.drop(files, {
        url: window.panel.api +"/" +this.$api.pages.url(this.$panel.view.path, "files"),
        accept: "text/csv",
        multiple: false,
    });
}

And when I drop a file on the dropzone I get the following error in the console:

TypeError: this.$refs.uploadDropzone.drop is not a function

Any help? Thanks!!!