Add file metadata to file DB page prop

file.go

@@ -0,0 +1,17 @@
+package notion
+
+type FileFile struct {
+	URL        string   `json:"url"`
+	ExpiryTime DateTime `json:"expiry_time"`
+}
+
+type FileExternal struct {
+	URL string `json:"url"`
+}
+
+type FileType string
+
+const (
+	FileTypeFile     FileType = "file"
+	FileTypeExternal FileType = "external"
+)