Hi all, Interesting discussion. Just to spice up the matter I would like to add few points  We do not use delta/diff uploads. If a newer file is detected, sync-engine downloads the whole file from the cloud. After syncing the whole file is uploaded to cloud. Reason being, no cloud other than Dropbox supports delta uploads/downloads. So, a single (all-in-one) monolith database will impact sync performance and data cost. However, one file per attachment will also hamper sync perform
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