To upload a construction set into a project for the first time, refer to the article Uploading Plans.
To upload more pages to the existing set, follow the steps below.
Step 1: Navigate to the Plans tab, and click the Construction Set tab.
Step 2: Select the 3 vertical dots at the right, and choose Upload plan page.
Step 3: Upload your PDF document by clicking upload from your computer or by dragging and dropping your file into the blue folder.
Note: Once you have added your new page(s), rearrange by grabbing the 6 dots in the upper left corner of a page and dragging it to the new location on the page.
You can also rearrange the pages by selecting the 3 vertical dots underneath the page name.