Speed tradeoff for when to show a file as a thumbnail. If set to "always" then always thumbnail, even if the folder is on a remote server. If set to "local-only" then only show thumbnails for local file systems. If set to "never" then never bother to thumbnail files, just use a generic icon. Despite what the name may suggest, this applies to any previewable file type.
Trédọ́ọ̀fụ̀ ngwangwa maka mgbe a ga-egosi inyogo faịlụ dịka tọ́mbnéèlụ̀. Ọ bụrụ na a haziri ya na "mgbe obụla" ya bụ tọ̀mbnéèlụ̀ọ́ mgbe ọbụla, ọbụrụgodi na nsomebefaịlụ ahụ nọ na rìmóòtụ̀ sava. Ọ bụrụ na a haziri ya na "nkeụlọ_sọsọ" ya bụ gosi sọsọ tọ̀mbnéèlụ̀ maka faịlụ sistem nkeụlọ. Ọ bụrụ na a haziri ya na "ọgaghị" ya bụ na enyekwala onwe gị nsogbu n'ị́tọ̀mbnéèlụ̀ inyogo, kama jiri aịkọn nyirionwe.