TypeError: NetworkError when attempting to fetch resource

This error occurs when attempting to add a Project Banner to an Umbrella project.
I’ve tried both jpg and png, full sized image files and cropped and rebooted.
There’s simply no means of putting an image on my umbrella project

I wasn’t able to replicate the issue on a test project. Could you include a link to the project you’re trying to change the banner of? There’s also an upload size limit, so if the image is several MB or larger it may need to be scaled down

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File size it was, thanks for your help