Multisites Users Profils sync

Hi,
I want to know if you have a solution to have 1 profile insted of multiple profil pages for multisite system?

I have Mydomain.com and on this website you can change you profil picture and description but if I go on Mydomain.com/site2 or Mydomain.com/site3 I need to write again everything and re-upload my profil picture on every sub-domain, it’s really annoying… Aand I was going to pay for some extentions but now not so sure about it anymore :/

Have a solution?
Regards.