Add upload functionality to fileHandler
Add upload functionality to fileHandler

alpheios-project/arethusa,alpheios-project/arethusa,Masoumeh/arethusa,PonteIneptique/arethusa,fbaumgardt/arethusa,alpheios-project/arethusa,Masoumeh/arethusa,latin-language-toolkit/arethusa,PonteIneptique/arethusa,latin-language-toolkit/arethusa,fbaumgardt/arethusa,fbaumgardt/arethusa