Guys, I had a question regarding GOG platform. Is there any feature to upload screenshots online so that my friends can see it? Like this feature is available on Steam. If there is, if possible, please share a screenshot of the path. Thanks in advance.

there is a specific thread for Galaxy help and feedback, if you want gOg's staff to see this then it may be better to post there

https://www.gog.com/forum/general_beta_gog_galaxy_2.0

No such feature exists in Galaxy at this point in time. They do not pre-announce upcoming features either so there's no way to know if they plan to ever add such a feature. They are however working on integrating the Epic Games Store into Galaxy as a consolation prize though. :o(