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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
It's actually this issue: https://github.com/espruino/BangleApps/issues/157
Details there, but basically the App loader takes a very basic approach to app uploads, so if the app is too big to fit into RAM as a text string then it can't be uploaded. The IDE is able to upload in chunks to avoid it.
It's something that should be fixed soon - but basically it is the size of the actual JS file that's the issue at the moment.
Definitely choosing 'image string' and the 'compression' checkbox in the image uploader should help you as @MaBe says.