Go to your Google Drive.
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Right-click on the folder.
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Select Share.
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Open the General access drop-down menu.
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Select Anyone with the link to publish your folder.
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Click Copy link and then Done.
You will get a URL like the following:
​https://drive.google.com/drive/folders/[Your Folder Id]?usp=sharing
You can see your folder ID that will looks something like: 1qGwpjmQIQO8rN1odas0njDSf72VRrTCa
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Copy you folder ID and add it to the following embeddable URL:
​https://drive.google.com/embeddedfolderview?id=[Your Folder Id]#list
Replacing the sample folder Id with the actual folder ID from step 6
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Use the URL from Step 7 as the iFrame URL in the client portal custom page setup. It should look like this: