Shared folders count against all accounts that take part in them, so if you want to share more data than your account has available in free space, you will be prompted to upgrade.
But then I have to pay personally, as well as the charity I work for having to pay - is that right?
If you want both accounts to be able to access more data than the free accounts capacity, then yes, both accounts have to pay for the upgrade.
I can understand now, why there is no official "Help" for this issue. I would invite an official DropBox representative to give me some rationale for the double charge beyond an "It's our policy" statement. The question is "Why?" BTW, I did not share any of the data. It is loaded from someone else's account. Do you have no way of tracking who contributes to a shared folder? Can not the owner of the folder pay for the space?
[Note: I do not work for dropbox.] The policy of having shared folders 'use' quota from each member is a justifiable business decision so that owners of a Pro or Business account do not sub-let their quota to others. From a technical point of view I can only speculate that having tables of CRC for each 4MB of storage on the servers is a reason to have shared-folders count against the quota of each member.
Rick, I appreciate your taking the trouble to answer, but I want DropBox's official answer. Those of us who do not work for them simply are speculating unless we are comfortable passing along a spokesperson's answer and citing it.
This is a User forum (99.9, so you are not going to get "official" answers here. In fact, the answers you get here may be BETTER than a corporate response because company reps are under restrictions of several kinds.
Rick M., I appreciate your clarification on the nature of the forum. Some companies do participate in their tech support forums, but many do not. I'm sure they find their support costs much less that way. For technical issues, I would agree and observe that is true with many support forums, which wouldn't work without dedicated posters like you. I have participated in a few myself. However, this is a policy issue i will submit next to their sales team. They have a responsibility to answer whether they choose to or not. Potential customers have a right to judge them for that, among other factors. Thanks again for your responses.
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