local area network – read-only access on Frtizbox FTP

I am trying to access the contents of my hard drive which is connected to a FRITZ!box 7490. The FRITZ! box can be accessed by both SMB and FTP. Sometimes I need to access files from outside of the FRITZ network so I use FTP and access it over the internet with a subdomain from afraid.org My problem is that, even though I have set the webGUI to allow access for me to access the files, I still get a read-only error. See below:

read only error
fritz config