[Plugin: MimeTypes Link Icons] 'Show file size of attachment' not working

Hi, thanks for the plugin. I’m having trouble getting the filesize to show up. I’ve checked the ‘Show file size of attachment?’ box but nothing changes. Maybe it is a conflict with my theme? . Note that the icons were not showing either until I enabled ‘Enable Asynchronous Replacement?’ so maybe a conflict with my theme (Suffusion) or another plugin?
Filesize is not essential but it is a nice to have. Any help appreciated.

PS – I think you have a typo on the Options page where you say… “If you want to have the file size of the attachment written in brackets next to the file size, tick this box”… I assume that should read “next to the file name”.

https://www.ads-software.com/extend/plugins/mimetypes-link-icons/