The Eraser Tool is used to erase only pen & highlighter strokes. It doesn't work for typed text, PDF text, images, scans, etc.
If the eraser doesn't work:
- Check if it is set to "Erase Highlighter Only" by double-tapping on the Eraser Tool icon in the toolbar.
- Are you trying to erase pen or highlighter strokes that are part of a PDF document? That sometimes happens when you exported a handwritten document and re-imported it. You can double-check if that is the case by trying to select something with the Lasso Tool. If that doesn't work, the document is most likely a PDF.