A 404 error normally means that what you request do not exist (not found). So perhaps the CardId is wrong somehow.
In general there do not seem to be anything generally wrong with the Trello API (I've made multiple attachments via the API today)
According to the call you have a Trello CardId of '668abaa10b40da3a2ca56242' in th e request... If there is no card with this id, or the logged in user do B not have access to this Card you would get a 404
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Yes, you can check if that is the reason.
To see the Id, you need to either:
1. Use the export to see the Id: https://www.youtube.com/watch?v=aWYEg1wPVYY
or
2. Use this PowerUp to see the id: https://trello.com/power-ups/646cc3622176aebf713bb7f8
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