Okay, I have built the latest v3 firmware (holy hell, PlatformIO made it so easy!!!) and flashed it to my hardware. I've also completed the webui steps to build the littlefs.bin. BUT... how do I upload the webui to the hardware?

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Make sure you have node.js with yarn installed (and fetched the submodule). You can find it here in the PlatformIO menu in VSCode: image