Some standard questions:
Thanks for the answers. Clearly Confluence has a problem with pptx files specifically (although they should work without any problems). There are several tickets in about ppt files working fine but pptx files not working. As a temporary workaround you could try attaching a ppt file and if that works use ppt until a fix is issued?
But you'll need to put a ticket into Atlassian because this is a bug, not a configuration issue.
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