Could you please not automatically reset the custom macOS app icon to the default one when updating? Until you update the icons to the Big Sur style, after every update I have to download the icon from macosicons.com and manually install it so that all the icons look the same style, and this is very annoying.
I haven’t tinkered with icons on macOS for some time… from what I remember, the icons are part of the app package… updating the app replaces the previously installed app package – and therefore comes with its own original Plex app icon. So I’m not sure what you’re asking for can actually be done.
At a minimum, Firefox, Steam, Spotify, Microsoft Office apps, JetBrains apps, and apps updated with the Sparkle framework do not reset the custom icon. So it depends on how the app developer implements updating their app.
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Wow, I thought this was annoying only to me 
I also constantly downloaded the icon from macosicons.com and replaced it, but Plex stubbornly changes it back every time after an update 
This is insanely annoying 
What’s more, a million years have passed but Plex still continues to use the old icon. It’s like a bull in a china shop.
Make an Alias, customize that icon.
Or an AppleScript:
In Script Editor:
tell application “Plex” to activate
Save as an Application.
Similarly, customize that icon.
It’s a temporary measure. Plex should have updated the icon long time ago to match the current design trends because now it looks really bad next to other icons.
