Can't add 'forms' it toolbar menu

Which product are you using?

PDF.js Express Plus 8.7.4

Detailed description of issue
As I understand Express Plus doesn’t have a ‘forms’ toolbar in default header settings.
I’m trying to add ‘forms’ to the toolbar menu in header
using method:

but it only added as an active toolbar (and I can see it in the first loading of the page and when I click on another toolbar it disappears)

Also while I’m trying to select an area for the creating new form
it returns an error in the console

Cannot read properties of undefined (reading 'READ_ONLY')
Screenshot 2023-10-31 at 11.50.40

Expected behaviour
I want to see and use ‘forms’ in my viewer

Does your issue happen with every document, or just one?

Link to document
{Provide a link to the document in question if possible}

Code snippet

          disableFlattenedAnnotations: true,
          path: `${process.env.VUE_APP_PUBLIC_URL}/pdfjs-express`,
          licenseKey: process.env.VUE_PDFJS_EXPRESS_TOKEN!,
          config: `${process.env.VUE_APP_PUBLIC_URL}/pdfjs-express/config.js`,
      ).then((instance: WebViewerInstance) => {
        const { documentViewer, annotationManager, Tools } = instance.Core
// try to add 'forms' in toolbar

// Try to fix an error ` Cannot read properties of undefined (reading 'READ_ONLY')`

Thank you for posting the incident to our forum. We will provide you with an update as soon as possible.

Hello Serhii,

According to our pricing page, user form filling is available, but not creating forms.

Best Regards,
Darian Chen

Thank you for your reply.
Could you please help me:
Which version should be used to create and edit `forms’

Hello Serhii,

After speaking with my team, it seems we do not support the ability to create fields such as the ones in the forms toolbar group. If you want to create forms, you will have to use something such as WebViewer:

However, PDF.js Express Plus will allow user form filling as mentioned on our price page.

Best Regards,