This is a file I just created and it takes over 30 seconds to open.
temp.ods (application/vnd.oasis.opendocument.spreadsheet), 7.58 KB, created by Dennis Wage on 2023-04-17 15:05:57 UTC
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Creator: Dennis Wage
Created: 2023-04-17 15:05:57 UTC
Size: 7.58 KB

Attachment is not viewable in your browser because its MIME type (application/vnd.oasis.opendocument.spreadsheet) is not one that your browser is able to display.

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Attachments on bug 154830: 186731