Compare the same title in two views
Locate an authorised title through direct folder browsing and then through the Library. Note whether one view exposes internal VIDEO_TS or BDMV directories while the other shows a playable item. That comparison concerns presentation and discovery before it concerns a decoder failing to play a video.
Firecore says Smart Folders flattens a folder into a playable item, hiding its exact structure. With the option off, normal folders remain visible and require another navigation step. Library browsing is unaffected by this setting, so matching the view is essential when comparing two screenshots or tutorials.
Choose the intended browsing tradeoff
Firecore describes artwork and fewer clicks with Smart Folders, while disabling it can make larger folder browsing faster and preserves the visible structure. Choose the behaviour suited to the collection rather than treating either presentation as automatically broken.
For help, include the Infuse version, Library-versus-folder view, share setting and whether the source is a directory or ISO/IMG file. Keep file permission and actual playback results separate. These facts distinguish a deliberate folder-presentation choice, a share configuration created earlier and a genuine later playback problem without changing or removing working media files.