Thanks for using Dropbox and helping test our beta build! Here are the user visible changes in v70:
v70 release notes:
We're rolling out mitigations for some types of unintended Smart Sync downloads.
Old macOS screenshot files that were not previously imported by Dropbox (e.g. due to being taken when the client was not running) will now be left alone rather than being automatically moved into Dropbox the next time that they're modified.
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