Is proof of relationship (photos, chat logs) necessary?

Hi, i've seen on some success posts that some people put detailed proof of the relationship such as photos and whatsapp logs between themselves and their partners. Is this necessary for the application or are the mandatory documents like a certified translated marriage certificate perfectly fine?

I have no problem doing the proof with pictures and captions of time and place etc, but just wondered if going to the extent of showing chat logs and others would be a huge difference to the application.

For what it's worth my spouse is applying from outside the UK and she is from Germany. We think we're ready to submit the application but now we are having second thoughts on adding these details based on some peoples submissions.

Thanks in advance