How do you upload your own images?

I just finished a 2400 piece puzzle and somehow I'm missing a single piece. My best guess is something happened with the physics and it pinged out of the board area at some point. Is there a way to reset piece locations to try to get it back?

I would like to get a little rundown on the cloudsave mechanics if it's not a bother... I bought a few copies of the game along with a few other friends and we started multiplayer for the enjoyment of it while chatting on voice. After initiating a new map on PC 1, we easily had PC2, PC3, and PC4 join. After the session ended, PC 2 wanted to come back later in the day to do a little more on the puzzle but was unable to find and access the cloudsave. I find that somewhat confusing, for I have a few other ga...

I was recently playing online on Twitch with friends when we ran into an issue with uploaded pictures. When we use stock pictures included with the game, everyone has no problems seeing the picture in puzzle pieces. When we use an uploaded picture from my PC, other players playing via online, they can only see the pieces of the puzzle, but not the actual picture in the pieces. They said they would see all white or all black. No picture. Anyone else have this problem? Is the Dev aware of this?...

I tried the dev's description in an older post but no matter what I write, my folder just doesn't appear. I have it on D (not C) and tried for almost an hour to make my folder appear to choose a picture from there. I also copied + pasted the link of an online picture of a site but this didn't work either. Maybe there is a bug with the cloud button ?? Oh, and the highest amount of pieces I can choose is something about 1.000 and not 5.000 like mentioned on the store page. And is there a way to turn of...