Мы давно не снимались is possible to say in the meaning of Снимать - take a picture / a video. Мы снимали видео/ фото в лесу . Now with a reflexive postfix -СЯ it's no more transitive , but reflexive. Мы давно не снимались.- We haven't been taken a picture of for a long time. / No one has taken a picture of us for a long time. Cheers!

Примеры использования слова "снимать": -снимать ботинки (take off shoes) -снимать одежду (take off clothes) -снимать фильм или видео (making movies, video) -снимать квартиру (rent an apartment) -снимать деньги в банкомате (cash out money from an ATM) -снимать проститутку (pay to hooker for spent time with her)

there are some meanings: to make a movie; to rent smth; to withdraw cash from your credit card; to undress. But your example is rather strange, it means that somebody doesn't play role in the movie for a long time.

Снимать: 1) to rent, to take a flat (apartments); 2) to remove, take off (clothes, shoes); 3) to take a pic (photograph); 4) to make a movie. Сниматься - to star. These are the main meanings. Your sentence - MY DAVNO NE SNIMALIS (like "we haven't seen each other for a long time")? has no sense. Мы давно не снимались - means that We haven't starred for a long time. If you want to say that we haven't seen each other for a long time - in Russian it will be Мы давно не виделись (to see - видеть).

I've read in one of my textbook that снимать is built on the old verb имать which means "to take", so all the meanings of снимать are related to the action of taking something in a way or another: take off garments, take a photo (or shoot a movie), take a flat (in renting), take money out of the ATM, etc. Just think имать when you meet снимать and all will be well :) https://ru.wiktionary.org/wiki/%D0%B8%D0%BC%D0%B0%D1%82%D1%8C