Launch the app once. The Quick Look extension is registered with the operating system the first time the app runs.
That model keeps its textures in separate files (.pmx, or .gltf with external references). A Quick Look extension can only read the file being previewed — that is an operating system restriction.
From then on, models in that folder show their textures in Quick Look too. .glb, .vrm, and .gltf files with embedded data are self-contained, so they never need this.
Quick Look (the Space bar) is handled by this app, but the app that opens on double-click is decided separately by macOS, and for these formats the built-in Preview app wins.
To open them in this app instead, select the file in the Finder and use Get Info → Open with → Change All once.
There are three ways in.
Open Settings (⌘, on Mac). When the size limit (1 GiB by default) is exceeded, the least recently used items are removed automatically. You can also remove items by folder, by how long they have gone unused, or all at once.
macOS 15 or later, or iOS 18 / iPadOS 18 or later.
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