After importing you can preview all pages. Click to select (single or multi-select; Shift for range), drag thumbnails to reorder, double-click to zoom in. Deleted pages go to Trash and can be dragged back. In the zoomed view: scroll to zoom, use the left thumbnails to switch pages, and the top toolbar to rotate / draw / insert text / select text. Then click "Export / Download".
Original size:
Drag pages back to the grid to restore them, or use Restore.
Current file size: