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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...
Hi connorhawke,
I could agree with you if the idea was for transformation Dropbox' underlying storage to case sensitive one. Unfortunately, it is NOT (could be considered as a imperfection - to put in mildly). Despite the storage itself is case insensitive, actual (case preserving) files names are keep and could be queried (and usually are received together with lowering case names variant)! It's up to the application (performing access to the storage) choose to lower case or preserving case - again both are available. Why the applications, you are referring to, select lower case?!... Ask corresponding providers! That's their fault. 🤷
Hope this clarifies matter.