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See https://www.dropboxforum.com/t5/Files-folders/Filenames-become-lowercase-when-attaching-from-DropBox-to-Mail/td-p/349737. Filenames should not become all lowercase when exporting a file from Drop...
This issue literally happens everywhere. Had to waste a few extra minutes just now reuploading a file to WeTransfer using Google Drive as DropBox changed the entire title to lowercase.
By the way, I got 3 kudos on my post above but the number of idea votes below still says 0. If these are different systems please remember to hit the correct button. If these should actually be the same then DropBox should make sure the votes are being counted correctly. (Not that votes should be required on an issue like this anyway.)