Structured storage and psd

HI guess!

Maybe someone may me help.

For example i have 1 project and on this project work 3 people. They all have own psd for work.

In the end we need merge this psd. How we can do this.

And maybe anyone knows, adobe have system for graphics commit like in git?

For example after work 3 designers just committed in one project and upload his own psd?

Thanks