Hi, Because they can't fix it and the user support is below normal standards that we might expect as paying customers. Support want's us to deal with this in private so they can hide the fact that there is no solution from the general public.
See another Dropbox support story at Ars Technica.
And because the customers are spread around the globe it is difficult for us to take any legal action.
I used to advice Dropbox to my clients but now have to think of another solution.
The solution is to use "selective sync" and wait for a complete sync before using "online only" to offload the folder. Partially synced folders take up the full space until sync completes. you dont sync everything in dropbox, you progressively sync folders and set them to “online only” immediately afterwards, then selectively sync another folder etc I noticed the fully synced and offloaded folders actually take up no space
I got all my files in "Online" mode, but they still take space of my computer. Here you can see it:
Thank you for your patience and feedback while we have been working on this.
We have a software update that will be available in our next version of the Dropbox desktop app.
The update will set placeholder files' logical size to zero bytes, this means that when viewing/managing storage on your macOS, the size taken up by these files should be accurately reflected.
This update will initially only be available to users who have opted in to the Early Access program.
To opt in, please contact our support team directly here stating that you wish to be opted in and reference “Zero Size Placeholders”.
If you already have a support ticket open with us, update it stating that you wish to be opted in.
We will contact you as soon as your request is processed with next steps.
Once this is completed, all placeholder files will be re-written with a logical file size of zero bytes which should resolve this issue for you.
While this is in early access, we will be assessing whether to roll out this update to all users.
Note that this update will only apply to macOS and will only address the issue as described in this post. There are possibly other issues in this thread which are unrelated and should be investigated separately.
Let us know if you have any questions on this.
Community Moderator @ Dropbox
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Solved! : See solution