Is there a way to store a large piece of binary data in the Turnbased room?

Hi.

I'm trying to store a texture in the Turnbased room, to make it persistent. The texture size is quite large and when I try to get a byte array from it and save it to room Custom Properties - there's a lag and Photon disconnects me.

Is there a convenient way to do that?
Or should I save it using direct call to my Azure Website (the one behind Photon Web-hooks).
Thanks