Just in case that someone runs into the same problem, I've been able to solve it.
Node is using formidable lib to upload files... Formidable default upload size value is 200Mb.
I've been able to change this value modifying incoming_form.js file located at <adapt_folder>/node_modules/formidable/lib
At line 28 you may change the value "200" for any desired vaule:
this.maxFileSize = opts.maxFileSize || 200 * 1024 * 1024;