Server error when adding products - troubleshooting not working

[harrietrosie]

I keep getting 'server error' when updating a product page. None of these have worked:

- Clearing cache and cookies

- Trying a different browser (firefox/chrome)

- Trying a different internet network

- Trying a different device

- Shopify status is all ok

- Waiting - it's been 5 hours and still not working

The only advice I can find says to do the above so I have no other ideas on what to do