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Hello Edward,

Thanks for reaching out to Sophos Community. 

It seems this is an identical post like this one:  (Missing Forum Thread) , but you have put additional details on this post. In the future, you may choose the option to edit and add more details instead of creating a new thread.

That said, I shall delete the first post shortly and let's stick to this recent one.

Thanks

While on that page, click help at the top.  That will lead you to the Help section which includes details on the file format.  Not mentioned but I think there is a size limit as well.

If that does not lead you to the answer, can you post (or DM me) the file you are trying to import.