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Currently, the only options from those pages are to attach link with a description, or notes, and I believe it would be a great implementation to also add the option to attach documents in the Opportunity Card, Service Order, and Service Quote, as the functionality already exists for other parts of Business Central such as Sales Order, Sales Invoices, and more.
STATUS DETAILS
Declined
Ideas Administrator

Thank you for reaching out. Your suggestion seems to be a duplicate of the following suggestions:  
- Opportunity https://experience.dynamics.com/ideas/idea/?ideaid=58151a0d-3a8e-eb11-8ced-0003ff45c92a
- Service Order/Quote https://experience.dynamics.com/ideas/idea/?ideaid=2e74ac75-f240-e911-867a-0003ff68b621

Please add your valuable votes and comments to the suggestions above instead.

Sincerely,
Andrei Panko
PM, Microsoft