If you cannot select text at all (no matter how hard you try), your pdf document is likely a scanned pdf.
You can only add text markup annotations (highlight, underline, strikeout) to real text, not to image.
If you cannot select text at all (no matter how hard you try), your pdf document is likely a scanned pdf.
You can only add text markup annotations (highlight, underline, strikeout) to real text, not to image.