Unable to upload .pptx to resources, even when .pptx is specified as an allowed file type under attachments

[BuzzK]

I was using a style sheet that was apparently not supported in the latest version, so it defaults to the default style sheet, which is OK. However, I'm now unable to upload .pptx to resources, even when .pptx is specified as an allowed file type under attachments.
Unable to upload .pptx to resources, even when .pptx is specified as an allowed file type under attachments

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