we made a game and want to try it on our pocketchip but we're not sure where to place the .png.p8

~/.lexaloffle/pico-8/carts

You have to go to the address bar in the file browser, and type a "." after the file browser address, it'll show you the .lexaloffle (hidden) folder then. Once you're in that, it's smooth sailing. Bookmark the "carts" directory.

On the Pocket Chip you can also press CTRL+H to show hidden files in the file manager.

I placed it in the folder but when i launch pico8 and press on my game it says "Could not load" its a .p8.png file like the rest of them

try to upload the file here, it's hard to say what's the problem without the file

fixed. i think the problem was i uploaded it to teknik and it change the file name and then i manually renamed it back. this time i put the png into a usb then connect the usb to my pocketchip and placed the file in the same location and it worked