Run FMT 2018 and apply one of the five duplicate names, different authors:reloadGraphicsX in Preferences> Skins.
Turn off and start FMT 2018 again. It can be seen that it is applied after a long loading time.
When changing the graphics folder :
It is reloaded with the skin that was not used.
In other words, You must reapply the unused SKIN_AUTHORxSKIN_TYPE before reloading.
(There are a total of twelve opportunities for graphics change.)
If you have spent all of your skin folders, or something makes you dizzy :
Just, Remove app - Turn iPad off and on - Reapply after app install.
MECHANISM :
Forces the reload to the settings of the graphics folder and the pictures folder in the skin file.
When applying a skin file for the first time, it uses the fact that it reloads to the cache.