Add all of these to your exemption lists on webfilters, firewalls and caching servers.
https://homework.realsmart.co.uk
https://portfolio.realsmart.co.uk
http://smartfuse.s3.amazonaws.com/
https://smartfuse.s3.amazonaws.com/
https://smartadmin.realsmart.co.uk
http://smartadmin.realsmart.co.uk
mail-attachment.googleusercontent.com
files.rlsmart.net.s3.amazonaws.com
dev-smart-site-assets.s3.amazonaws.com
Advanced list - ie if you’re still having problems - thanks to Chromestead
Google Drive for your PC/Mac
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www.google.com:443/HTTPS
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accounts.google.com:443/HTTPS
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clients3.google.com:443/HTTPS
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talk.google.com:5222/XMPP
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drive.google.com:443/HTTPS
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www.googleapis.com:443/HTTPS
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ssl.gstatic.com:443/HTTPS
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*.docs.google.com:443/HTTPS
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*.drive.google.com:443/HTTPS
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*.googleusercontent.com:443/HTTPS
Google Drive on the web
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s.ytimg.com:443/HTTPS
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video.google.com:443/HTTPS
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lh3.google.com:443/HTTPS
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lh4.google.com:443/HTTPS
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lh5.google.com:443/HTTPS
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lh6.google.com:443/HTTPS
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mail.google.com
For Drive, Docs, Slides, and Drawings
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http (port 80) connection to docs.google.com, docs[N].google.com and*.docs.google.com, where is a number from 1 to 9 eg docs3.google.com
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https (port 443) connection to docs.google.com and docs[N].google.com.
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https (port 443) connection to *.docs.google.com.
Sheets
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http (port 80) connection to spreadsheet.google.com, spreadsheets.google.com,spreadsheets[N].google.com, and *.spreadsheets.google.com.
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https (port 443) connection to spreadsheet.google.com,spreadsheets.google.com and spreadsheets[N].google.com.
Sites
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http (port 80) connection to sites.google.com.
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https (port 443) connection to sites.google.com.
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https (port 443) connection to *.sites.google.com.
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https (port 443) connection to *.googlegroups.com.
Drive, Docs, Sheets, and Slides
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https (port 443) connection to ssl.gstatic.com.
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https (port 443) connection to www.google.com.
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https (port 443) connection to *.googleusercontent.com.
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https (port 443) connection to gg.google.com.
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https (port 443) connection to *.googleapis.com.