File collection with registered uploadcare media_library throws error "params.mediaFolder" is not allowed to be empty

I made a file collection for site settings, added an `image` widget for the logo.
My CMS object has `uploadcare` registered as media_library and it's working throughout the entire site.

But whenever I try to browse to the settings entry, I get this error `"params.mediaFolder" is not allowed to be empty`.

```js
const settings = {
name: "settings",
create: false,
delete: false,
label: "Site Settings",
label_singular: "Site Setting",
description: "Site Settings: Logo, Global Meta Title etc.",
files: [
{
name: "global_settings",
label: "Global Settings",
file: "/site/_data/cms-settings.yml",
extension: "yml",
format: "yml",
fields: [
{
label: "Logo",
name: "logo",
widget: "image",
hint: "The global site logo shown in header & footer - **best to use an SVG.**",
choose_url: false,
},
{
label: "Meta Title",
name: "title",
widget: "text",
hint: "The global meta title.",
},
{
label: "Meta Description",
name: "description",
widget: "text",
hint: "The global meta description.",
},
],
},
],
};

export default settings;
```

CMS init object:
(xxxxxxx is redacted)
```js
CMS.init({
config: {
load_config_file: false,
backend: {
name: window.CMS_BACKEND_NAME,
repo: window.CMS_REPOSITORY,
branch: window.CMS_BRANCH,
proxy_url: window.CMS_PROXY_URL ?? null,
local_backend: window.CMS_LOCAL_BACKEND ?? false,
},
editor: {
preview: false, // until we have an actual custom preview...
},
site_url: window.CMS_SITE_URL,
display_url: window.CMS_DISPLAY_URL,
publish_mode: window.CMS_PUBLISH_MODE,
logo_url: "xxxxxxx",
media_library: {
name: "uploadcare",
config: {
publicKey: window.CMS_UPLOADCARE,
},
},
collections: [
settings,
xxxxxxx,
xxxxxxx,
],
},
});
```

In any other collection I can upload images np, only the file collection throws this error.

This is unexpected to me and unless I am missing something essential, I believe this is a bug.