Save texture to room CustomProperties

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Hi!

I'm trying to use PUN for an interactive painting app. It's something like Paint, but it's online and multiple users can paint in it simultaneously. Another feature is that sessions need to be stored for long time, with ability to reconnect, as in turnbased games.

I tried to synchronize texture changes via room CustomProperties, in order to be able to persist them via WebHooks, but performance is very poor.

One more thing I tried is PunRPC calls with AllBuffered mode. This one works fine in real-time, but I'm not sure if I'll be able to persist it. PUN Turnbased doc says not to use those for turn-based.

What would you recommend?
Thanks.