Wow, thank you torresm! Very insightful. Yes, soon after I posted, I figured the assets may have been in the *.rpa files as they're so much bigger in size than other files in the `game/` directory. I was just looking into how to unpack *.rpa files when you responded.Most of the images and videos are inside the *.rpa files you'll find inside the /game/ folder, they're not normally accessible unless you use a tool to unpack them. That's why those folders are mostly empty.
As for that error, it's a known issue. For that particular image, the code refers to it as *.webp but in the release version it's a *.png instead. If you want, you can drop this copy of the image in the /images/v13 folder and the game will be able to load it.
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And I appreciate you sharing the file. I'll load that into the game then. How did you find the file in *.webp format if it's only included as *.png in the game assets currently, if you don't mind me asking?