Inkscape can create a suitable vector file for laser cutting. SVG is a practical production format. PDF can also work when the required lines and shapes are saved as vectors.
Set the dimensions and units
Select millimetres in the document settings and check the part's dimensions. An 80 by 40 mm rectangle should have those dimensions in the file. The page boundary is not a cutting instruction; only add a frame if it should be produced.
Create paths and give them line colours
Draw the cutting contours and give each required shape a visible line colour. A coloured fill alone is insufficient. Use the same colour for paths intended for the same operation. In the portal, assign cutting, line engraving or area engraving to each colour.
Area engraving requires closed shapes. To use text, select it and choose Path > Object to Path. Save an editable copy first.
Remove effects and additional objects
Photos, blur, shadows, masks and construction lines do not belong in the production copy. An effect may look unchanged in a PDF because it was saved as an image; that does not create a usable laser contour. Inspect the actual paths and remove duplicate lines.
Save a production version
Keep the original SVG. To create a PDF, save a copy as Portable Document Format. Reopen that export and compare shapes and dimensions, then upload and check the result.
There is no need to rename a PDF to AI: renaming does not convert its content. See the drawing guidelines for colours and read about text outlines.