TinyMce文件选择器大文件不发送

I am using tinymce to write some text and upload pictures to a website. I am using this:

tinymce.init({
        selector: ".tinymyce",
        theme: "modern",
        plugins: [
            "advlist autolink lists link image charmap preview hr anchor pagebreak",
            "searchreplace wordcount visualblocks visualchars code fullscreen lineheight",
            "insertdatetime media nonbreaking save table contextmenu directionality",
            "emoticons template paste textcolor"
        ],
        toolbar1: "insertfile undo redo | styleselect | bold italic | alignleft aligncenter alignright alignjustify | bullist numlist outdent indent | link image",
        toolbar2: "preview media | forecolor backcolor lineheightselect fontsizeselect emoticons",
        lineheight_formats: "8pt 9pt 10pt 11pt 12pt 14pt 16pt 18pt 20pt 22pt 24pt 26pt 36pt",
        fontsize_formats: '8pt 10pt 12pt 14pt 18pt 24pt 36pt',
        font_formats: 'Arial=arial,helvetica,sans-serif;Courier New=courier new,courier,monospace;AkrutiKndPadmini=Akpdmi-n',
        image_advtab: true,
        paste_data_images: true,
        file_picker_callback: function(callback, value, meta) {
            if (meta.filetype == 'image') {
                $('#upload').trigger('click');
                $('#upload').on('change', function() {
                    var file = this.files[0];
                    var reader = new FileReader();
                    reader.onload = function(e) {
                        callback(e.target.result, {alt: ''});
                    };
                    reader.readAsDataURL(file);
                });
            }
        }
    });

If I upload an small image this is storing ok to the database, but when I upload a very large imagen (8mb) is not storing on the database.

I am using PHP and with that textarea I also send more data. I output the whole POST and the only variable / field that is not sent is the textarea with TinyMce.

I change my php variables:

post_max_size = 1024M
upload_max_filesize = 1024M
max_input_vars = 500000

But still nothing. What could be the error?

Thanks.