Concepts does not currently support exporting multiple drawings or separate layers into a single PDF file. This is a popular request we hope to support in the future.
In the meantime, you can use this workaround to create a multi-page PDF from a single drawing.
Workaround: Create a Multi-Page Drawing
- Start a new drawing and set an Artboard to your desired page size.
- Export this blank drawing as a 'PDF (Single Page)'.
- In your main drawing, use the Import menu to import the blank PDF page you just created. Import one copy for each page you need.
- Position the imported pages on your canvas and add your drawings to each one.
- When finished, export your drawing as a 'PDF (Flattened)'. This will create a single PDF file with multiple pages.