I am unable to drag an image into TinyMCE 5.7.0, it just makes an error "Dropped file type is not supported". Dragging and dropping into the image upload modal works fine, but into the main window does not. A similar question here had an answer that suggested setting block_unsupported_drop to false but all that does is make the image open in another tab.
Here is the contents of the fiddle
<script type="text/javascript">
tinymce.init({
selector: "textarea",
images_upload_url: '/upload/tinymce',
automatic_uploads: true,
image_file_types: 'jpeg,jpg,jpe,jfi,jif,jfif,png,gif,bmp,webp',
});
</script>
<form method="post" action="dump.php">
<textarea name="content"></textarea>
</form>
I created a fiddle that shows the problem https://fiddle.tiny.cloud/25haab
I actually found a commit in TinyMCE that says this version fixed the problem but evidently not. Thanks for any ideas.