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https://www.travelchinaguide.com/embass ... intro2.htm

Passport holders of the following 53 countries and regions can be granted a visa-free stay up to 72 hours while transiting via Beijing Capital Airport, Shanghai Pudong Airport, Shanghai Hongqiao Airport, and airports of Guangzhou, Chengdu, Chongqing, Shenyang, Dalian, Harbin, Xian, Guilin, Kunming, Hangzhou, Wuhan, Tianjin, Qingdao, Nanjing, Changsha, and Xiamen:

24 Schengen Agreement Countries: Austria, Belgium, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland

15 Other European Countries: Russia, the United Kingdom, Ireland, Cyprus, Bulgaria, Romania, Ukraine, Serbia, Croatia, Bosnia-Herzegovina, Montenegro, Macedonia (FYROM), Albania, Belarus, Monaco

6 American Countries: the United States, Canada, Brazil, Mexico, Argentina, Chile

2 Oceania Countries: Australia, New Zealand

6 Asian Countries: Korea, Japan, Singapore, Brunei, United Arab Emirates, Qatar

3 144-Hour Visa-Free Transit
Passengers from the above countries transiting in Shanghai, Jiangsu, Zhejiang, Beijing, Tianjin, Hebei, and Liaoning can enjoy a visa-free stay up to 144 hours. They may be able to use this facility in Guangdong in the near future.

I did this in January. You need to print off a copy of your confirmed onward flight. The e-ticket should do.
There is a special immigration desk at PVG for the visa free transit pax.
Despite notices saying that a form had to be completed, in fact none was required, beyond the normal landing card.
It took a long time for each pax to be processed and it seemed that those wanting the 72 or the 144 hour layovers had to step aside and be dealt with after the 24 hour people.
As said, you may find problems at check-in, so do so early.