Before saving the vector image as an SVG file you need to ensure that the SVG export options are set correctly.

To set the SVG export options, go to File Menu > Vector > SVG Export Options.

To specify whether the currently loaded raster image is included in the exported SVG file then select:-

  File Menu > Vector > SVG Export Options > Attach Raster Image

To specify whether the current vector line widths are included in the exported SVG file then select:-

  File Menu > Vector > SVG Export Options > Include Vector Line Widths