Wagtail upload-only document chooser

blocks.py

from .views import upload_only_document_chooser_viewset

UploadOnlyDocumentChooserBlock = upload_only_document_chooser_viewset.get_block_class(
    name="UploadOnlyDocumentChooserBlock", module_path="myapp.blocks"
)

models.py

from django.db import models
from wagtail.fields import StreamField

from .blocks import UploadOnlyDocumentChooserBlock


class MyModel(models.Model)
    body = StreamField([
        ('document', UploadOnlyDocumentChooserBlock(),
        # ...
    ])

upload_only_chooser.html

{% load i18n wagtailadmin_tags %}
{% include "wagtailadmin/shared/header.html" with title=page_title merged=1 subtitle=page_subtitle icon=header_icon %}

{{ creation_form.media.js }}
{{ creation_form.media.css }}

<div class="w-tabs" data-tabs data-tabs-disable-url>
    <div class="w-tabs__wrapper w-overflow-hidden">
        <div role="tablist" class="w-tabs__list w-w-full">
            {% include 'wagtailadmin/shared/tabs/tab_nav_link.html' with tab_id=view.creation_tab_id title=creation_tab_label %}
        </div>
    </div>
    <div class="tab-content">
        {% include view.creation_form_template_name %}
    </div>
</div>

views.py

from wagtail.documents import get_document_model_string
from wagtail.documents.views.chooser import DocumentChooserViewSet, DocumentChooseView


class UploadOnlyDocumentChooseView(DocumentChooseView):
    template_name = "upload_only_chooser.html"


class UploadOnlyDocumentChooserViewSet(DocumentChooserViewSet):
    choose_view_class = UploadOnlyDocumentChooseView


upload_only_document_chooser_viewset = UploadOnlyDocumentChooserViewSet(
    "upload_only_document_chooser",
    model=get_document_model_string(),
    url_prefix="upload-only-document-chooser",
)

wagtail_hooks.py

from wagtail import hooks

from .views import upload_only_document_chooser_viewset


@hooks.register("register_admin_viewset")
def register_upload_only_document_chooser_viewset():
    return upload_only_document_chooser_viewset