update.php

<form action="<?= PluginEngine::getURL(NextcloudPlugin::class, ['from_plugin' => $from_plugin], 'file/update/' . $file->getId()) ?>"
      enctype="multipart/form-data" method="post" class="default">
    <?= CSRFProtection::tokenTag() ?>
    <fieldset>
        <legend><?= dgettext('NextcloudPlugin', 'Neue Dateiversion') ?></legend>
        <label class="file-upload">
            <?= sprintf(
                dgettext('NextcloudPlugin', 'Bitte die neue Version der Datei %s auswählen.'),
                htmlReady($file->getFilename())
            ) ?>
            <input type="file" name="file">
        </label>
        <label>
            <input type="checkbox" name="update_filename" value="1">
            <?= dgettext('NextcloudPlugin', 'Dateinamen aus neuer Dateiversion übernehmen.') ?>
        </label>
    </fieldset>
    <footer data-dialog-button>
        <?= Studip\Button::createAccept(dgettext('NextcloudPlugin', 'Aktualisieren'), 'confirm') ?>
        <?= Studip\LinkButton::createCancel(
            dgettext('NextcloudPlugin', 'Abbrechen'),
            $controller->url_for(
                (in_array($folder->range_type, ['course', 'institute']) ? $folder->range_type . '/' : '')
                . 'files/index/' . $folder->parent_id
            )
        ) ?>
    </footer>
</form>