Hi Ernie,
Is this when going to File > Export WebP or when going to File > Export and selecting the webp option? This error basically means that the filter type is not set within the export dialog. I've seen this before with PDF as well when for some reason the 'save as type' option is blank when trying to save, instead of the actual format selected. Might be worth checking that WebP is actually set in the export option
Thanks
Rob
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