The issue that I am running into is setting the password changes the binary of the excel. So this means that the file has to be downloaded on every computer it is being shared with. Now the problem is that aggregate size of these files is way more than the bandwidth I can hold up. Is there any way to solve the problem?
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Why would you change the password so often,? If it’s for security, did you know that Excel passwords are not secure. You can just open the file in XML and extract the password text in a few minutes after some googling. (or download a paid / free app that does it for you)
That being said, changing the password WILL change the xml of the excel, and dropbox WILL resync. there’s no way around that bit with your current setup.
However, To address the bandwidth problem. it sounds as if you have multiple computers on the same network so this dropbox update is maxing out your bandwidth.
To that, I’d recommend turning on Dropbox’s ‘Lan Sync’ feature, so that all the computers on the network will update form each other, rather than uploading it to dropbox, and redownloading it X times.
If your computers are not on the same network, you’ll likely need to drop dropbox and switch to an alternative file hosting method.