Contact Form 7 File Uploading

I inserted the file attachment with no file limit or file type, like this: “[file file-183]” and in the field “file attachment” I put “[file-183]”, I sent a file of 180kb and it worked, the message arrived at my email with the file attached. But, when I put file limit and file type like this: “[file file-183 limit:10mb filetypes:jpg|jpeg|png]”…It doesn’t work, the Contact Form loads forever when I click submit. What could be the problem? I’m testing it on Local Host.