No sense for Dropbox users

Dropbox generates one-time-links without extension. The app says: Filetype not supported, because the pdf extension does not exists.

As a Software developer, I am asking myself where the developer has lost his brain to check the f*ck*ng file extension, the most stupid way to check a filetype.

Update, please!!!!!

Ralf aus HH about Sign It! - Fill, Sign and Send PDF Documents