ok - its unlikley to be a CC app bug.
I have the same CC version working Ok with dropbox.
is that metadata.db the same file as the one in your source library. use a file comparison utility or at least compare bytes size
try replacing it with a known good copy
and do a files and folders count of what is in dropbox vs what is in your local source library
the recommended way to add to dropbox is via the dropbox app: put the files & folder into the local dropbox x folder and wait for dropbox to completely sync.
adding via a browser in windows is NOT reliable.
In parallel you could also try this test. Install the free calibrebox app from play store & link it to your dropbox. Does that app also say database corrupt or is it happy to transfer books...
if 2 different apps say corrupt database then you almost certainly have a corrupt database.
if not, then at least you have a workaround while you pursue the issue with CC developers
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