I can't select a custom sight

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My UserSight folder has two kinds of folders; custom sights that are for all tanks, and custom sights for a specific vehicle. However, no matter what I try, none of the .blk files I drop into the files show up as a selectable option in-game. The only thing War Thunder allows is the vanilla presets. How do I fix this?

Mine also seems buggy that sometimes it would just switch itself back to default and occasionally won’t load at all, you can try pressing alt+f9 to reload your custom sight while ingame, the game will freeze for two seconds then your custom sight should shows up after that.