There is a way to do the entire space during migration with Confluence migration assistat and a way to send only attachments.
When only attachments are migrated, Cloud Confluence
Is there a way to check that the attachments have been migrated?
I haven't performed an attachment-only migration myself as yet but could you create a backup of the Cloud site with attachments and compare it with size of attachments on the local site?
There's probably a better way of knowing (API, audit log, data center/server logs and so on) but the backup should work as an alternative.
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