XF 2.2 How are changes handled during upgrade


Active member
Sorry for newbie question here, but if I have a custom style, how does XenForo handle upgrades against those styles? Do they stay completely unchanged, does it show a conflict and allow to merge, or are any custom changes overwritten?

Similarly, is it recommended to upgrade via admin portal or to manually do it via copy / paste of files and then upgrade?

I noticed that in my development environment, I cannot use in-place upgrade with dev mode enabled, is there a reason why? Seems counterintutive to upgrade differently in dev/test environment from production?

Context, only going from 2.2.13->2.2.15, but trying to understand what to expect (one bug fix actually goes against behavior I prefer :P).
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