See New Features Rolling Out Soon
It would be nice if it were possible to insert an entire album automatically
There is a border when you insert from Google Drive, however, there is no border when using an embed code. The only downside is that the links don't work when embedding.
To Embed Google Drawings
Open a Google Drawing .
At the top, select File > Publish to the web
Choose Embed
Click Publish
Copy the code and paste it into Google Sites (Select Embed from the Insert menu and choose Embed Code)
From this Community post: https://support.google.com/sites/thread/143799519?msgid=143827595
See example below: