Does Genshin Impact have cross-platform play and cross-save?

Can you crossplay and cross-save on Genshin Impact between PC, PS4 and mobile?

Notice on Cross-Save Function Between Account for PSN and

Is there a firm answer if there is cross-play/save between Xbox

Genshin Impact (Page 5)

Genshin Impact: How Does Cross-Saving Work?

Genshin Is Genshin Impact Cross Platform? - GameWith

James Law (Page 2) Rock Paper Shotgun

Is Genshin Impact cross platform? Cross saves made easy

Genshin Impact: How to Link PS4/PS5 to PC/MOBILE

Genshin Impact: Guide To Cross-Save