You have not met and talked to "everyone" or Edison would set up the camera. You need to see each person, including the guard at the back of the train (far left). There are the 4 crew and 9 passengers including Edison.
You talk to the passengers and crew and solve the mystery. The first theft is from Thomas Edison, when his motion picture camera disappears. Later, the camera is located but someone steals a valuable piece of equipment that is vital to the World's Fair. (see related question)
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in his cabin you can find it by running through the train cars and entering the door that says (Thomas Edison)
Mademoiselle Repertor Chick, left of edison
Thomas Edison's house is at 1877 AD (9 o'clock on the time device).
Thomas Edison is at 1877 AD (9 o'clock on the time device).
Before you can start the detective quest, you have to walk through the whole train and speak to all of the passengers and crew. Once you speak to everyone, go to Thomas Edison's cabin to see his invention. Until you talk to everyone aboard, Thomas Edison will only tell you to come back later.
Use Edison's machine to tell about the picture.
HJ
The main antagonist who stole Thomas Edison's invention on Mystery Train Island was a character named the "Conductor". He wanted to use the invention for his own evil purposes, leading players on a thrilling adventure to track him down and stop his plans.
the rest of the sun stone is where thomas Edison is its on the chimney of his house in time tangled. thomas Edison is in the 1877 AD. i hope this helped you!
You return it to Thomas Edison in 1877 AD. The phonograph also has an actual recording of Edison's voice that you can play.