TinyMCE file_browser_callback not showing browse button - tinymce

Question

I am unable to get the TinyMCE file_browser_callback property to work, so that the Image dialog shows a browse button.
I downloaded TinyMCE 5.08 from tiny.cloud (prod version). I insert the library, then call init() below. I added a file_browser_callback property with a callback function, which is supposed to open a modal window, from where I pick up a file from a media library and insert it back.
For reasons I cannot understand I cannot make the browse button, in the image dialog, visible.
<script src="{{ asset('js/tinymce/tinymce.min.js') }}"></script>
<script>
$(function() {
tinymce.init({
height: 500,
selector: 'textarea.wysiwyg',
plugins: ['image'],
branding: false,
convert_urls: false,
file_browser_callback: function(field_name, url, type, win) {
$('#file-modal').modal({
duration: 200,
onApprove: function () {
if ($('#file-modal .file.selected').length) {
let $file = $('#file-modal .file.selected');
win.document.getElementById(field_name).value = $file.data('path');
}
}
}).modal('show');
}
});
});
</script>
The browse button should appear when the callback exists. I've tried implementing the callback as a separate function and passingit as a string with no luck. There are no error messages visible in the console.
I also tried 5.07 with no luck. I have this working on a separate application

Answer 1

The API you are using is a TinyMCE 4 API. Per the migration documentation, in TinyMCE 5 you need to use file_picker_callback instead:
https://www.tiny.cloud/docs/migration-from-4x/#file_browser_callbackfile_picker_callback
https://www.tiny.cloud/docs/configure/file-image-upload/#file_picker_callback

Answer 2

Well, it appears TinyMCE dropped the support for file_browser_callback from their 5.x versions. Propably because they offer file hosting cloud services themselves now and it might be a premium plugin. What a fantastic solution. I'll fall back to using 4.9.4 prod version.