Look at this
FIRST STEP: UPLOAD LINK
http://prntscr.com/nsb7ff
NEXT STEP: CLICK, PLEASE INDEX MY SITE
http://prntscr.com/nsb7zv
and in next step you will see recaptcha3, sometimes there is no captcha, but if you want to upload more links you will see.
http://prntscr.com/nsbfdp