Adding layers with transparent backgrounds to a pdf

[TheFreck]

I'm trying to create a pdf document that has an opaque base layer to add three layers with transparent backgrounds onto. So far I've been able to add a new page to the base document which Gimp then recognizes as a layer (Acrobat still shows them as pages, not layers). But the background is opaque so you can only see one layer at a time.

Is there a better way to do what I'm trying to do?

`const pdfDoc = await PDFDocument.create();
const layer1 = pdfDoc.addPage(width,height);
const layer2 = pdfDoc.addPage(width,height);
const layer3 = pdfDoc.addPage(width,height);
const layer3 = pdfDoc.addPage(width,height);

layer1.moveTo(x,y);
layer2.moveTo(x,y);
layer3.moveTo(x,y);
layer4.moveTo(x,y);

layer1.drrawSvgPath(layer1String,{scale: pdfScale});
layer1.drrawSvgPath(layer2String,{scale: pdfScale, opacity: 0});
layer1.drrawSvgPath(layer3String,{scale: pdfScale, opacity: 0});
layer1.drrawSvgPath(layer4String,{scale: pdfScale, opacity: 0});

let pdfBytes = await pdfDoc.save();`