1
Inspect the copied line
Paste one Tamil sentence into a plain-text field. Compare its letters, spaces and punctuation with the source. If they differ, correct the text before playback.
2
Restore sentence boundaries
Remove page numbers and unwanted line breaks copied from a PDF. Keep punctuation where a speaker should pause, then test that sentence on its own.
3
Listen, then revise
If the text looks right but sounds wrong, check whether the chosen tool offers an appropriate Tamil voice. Replay a short sample before preparing the full passage.