'How can I force an Outlook Addin-in to be active immediately?

I have an Outlook Add-In that is basically fine; but often (not always) when I want to make a change, which I upload with Filezilla, it is not active straight away. I use F12 DevTools and I have a Console Log showing the version number so I know it's not updating correctly. I haven't been able to find an answer despite many (apparently) similar questions ... is it Cache?



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