After creating a polyline, export it as a dxf.
- In QGIS, import the dxf. The polyline becomes "curves" or "lines"
- After saving the dxf polyline as a shapefile, use Geometry tool >> "Collect Geometries", making a single polyline.
- Extract vertices from the polyline. It will extract sequential points along the line.
- Use the points in MF Tool.
Lines to Polyline - Sequential points (QGIS)