Changing flights after receiving Chinese visa (and some other questions)

I'll be applying for a (first time) Chinese tourist visa. Because of my travel itinerary, I'll need a double-entry visa. However, many sources state the consulate will only delivery single-entry ones if you're applying for the first time. Is this true or will I be fine if I can prove I will enter China twice?
Second, I'm a bit confused about the photo requirements. I just went to a photograph to get passport photo's in the format they require and now it seems they just changed the requirements: the visa form V.2013 is not longer accepted. Now, you need to fill in the form on a website, print it out and sign it. The issue is... you need to upload a photo as well. I only have the photo's in paper form. Does that mean I will have to get new passport photo's and ask for a digital copy this time (which also has very specific requirements), along with printed copies (as you still need to provide those as well)? Does anyone have experience with this?
My last question: once my visa is approved, can I change the flight date? I'm considering rebooking my flight to arrive a few days earlier so I have a little more time in China, is this an issue as I need to provide my flight tickets when applying for the visa? I know you can cancel and rebook other hotels, but is it the same with flights?
Thanks
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Do you need a visa if you have a connecting flight in China?
Foreigners who have confirmed onward tickets and seats on international flights and directly transit through China and stay for no more than 24 hours within the airport boundaries do not need to apply for a transit visa.Can you have two visas at the same time China?
You can have as many visa as you want. The limit is the number of free pages in your passport (or one or two less).Why would a Chinese visa be denied?
The applicant is from a country where war, terrorist attacks, or political unrest frequently happen, or whose nationals frequently overstay their visas, or a country with strained relations with China. The applicant has a criminal record.What happens if you overstay Chinese visa?
If you stay on Chinese territory longer than the validity of your Chinese visa, you will not be allowed to leave the country. You will have to pay a fine, which increases per additional day of overstay. To leave the country, you will also need a new exit visa.5 Signs that China will soon open up for International travel.
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