discourse-custom-wizard/assets/javascripts/discourse/templates/components/custom-wizard-composer-editor.hbs

<div class={{this.fieldClass}}>
  <DEditor
    @tabindex={{field.tabindex}}
    @value={{composer.reply}}
    @placeholderOverride={{replyPlaceholder}}
    @previewUpdated={{this.previewUpdated}}
    @markdownOptions={{markdownOptions}}
    @extraButtons={{this.extraButtons}}
    @importQuote={{this.importQuote}}
    @showUploadModal={{this.showUploadModal}}
    @togglePreview={{this.togglePreview}}
    @validation={{validation}}
    @loading={{composer.loading}}
    @showLink={{showLink}}
    @wizardComposer={{true}}
    @fieldId={{field.id}}
    @disabled={{disableTextarea}}
    @outletArgs={{hash composer=composer editorType="composer"}}
  />

  <input
    type="file"
    id={{this.uppyComposerUpload.fileUploadElementId}}
    class="wizard-composer-upload"
    accept={{this.allowedFileTypes}}
    multiple
  />
</div>