1. Open up the Project page and click Edit. Each group belongs to one column. Click edit on each column.
2. Under the column body, click "Source"
3. Find the paragraph belongs to iframe (where the pdf embedding will happen).
4. You will find src="" in that paragraph.
5. In between the double quote, insert the formatted link of the Google PDF. Refer below for instructions.
IMPORTANT: the link needs to be formatted as follow
"https://drive.google.com/file/d/<INSERT ID>/preview".
In <INSERT ID>, insert the ID of the Google PDF which you can find when you right click the pdf on Google Drive -> Get Sharable Link. The long sequence of character after /d/ is the ID. Copy that ID and insert it in the link template above.
EXAMPLE: "https://drive.google.com/file/d/19a82AZW19J39v49Au97pUK6bRZpBOU_F/preview"
This is how is should look like:
6. Repeat Step 2 to Step 5 for the other groups.
7. Click Save.