function ReloadPage;
Reloads the currently selected page from the PDFium engine, refreshing the page object cache.
Use after low-level PDFium edits that bypass the TPdf editing methods, or to recover after an aborted edit.
Wraps the corresponding PDFium API and exposes it as a TPdf instance member so consumers do not have to manage FPDF_DOCUMENT handles directly.
Pdf1.Active before calling page-scoped operations; methods that require an open document raise EPdfError otherwise.SaveToFile to persist.
if Pdf1.Active then
Pdf1.ReloadPage;