How to add a Chinese in-production title?

I have been attempting to create a new in-production title for a film I worked on as a co-writer. The film, however, is in Chinese and is being shot in China by a Chinese production company, and subsequently all of the potential third-party links to substantiate the film being in production are Chinese.

Is there another way I can verify the authenticity of the film and its in-production status? Copies of my contract with William Morris Endeavor and the Chinese production company? I also have hundreds of production stills I took of sets under construction, location scouting, etc. It's a for-real production with a large budget, it's just Chinese.