Fox files not showing thumbnails in all documents section

backend/handlers/onlyoffice.go

@@ -362,12 +362,30 @@ func (h *OnlyOfficeHandler) ListOfficeFiles(c *fiber.Ctx) error {
 		if strings.HasSuffix(strings.ToLower(info.Name()), ext) {
 			relPath, _ := filepath.Rel(h.Config.StorageDir, path)
 			relPathSlash := filepath.ToSlash(relPath)
+            
+			chk := checksums[relPathSlash]
+			if chk == "" {
+				// Fallback: the path in the database might have a different prefix format 
+				// (e.g. "/test.docx", "./test.docx") or different casing.
+				cleanRel := filepath.ToSlash(filepath.Clean(relPathSlash))
+				cleanRel = strings.TrimPrefix(cleanRel, "/")
+				
+				for k, v := range checksums {
+					cleanK := filepath.ToSlash(filepath.Clean(k))
+					cleanK = strings.TrimPrefix(cleanK, "/")
+					if strings.EqualFold(cleanK, cleanRel) {
+						chk = v
+						break
+					}
+				}
+			}
+            
 			results = append(results, OfficeFile{
 				Name:     info.Name(),
 				Path:     relPathSlash,
 				Size:     info.Size(),
 				ModTime:  info.ModTime().UTC().Format("2006-01-02T15:04:05Z"),
-				Checksum: checksums[relPathSlash],
+				Checksum: chk,
 			})
 		}
 		return nil