Your referees will receive a link to an online application system where to upload their letters in PDF format (not larger than 2 MB). The file can only be uploaded once. A successful upload will be immediately confirmed on screen. If they fail to upload their file for the first time, or if there is no onscreen confirmation, they should contact application[at]geas.fu-berlin.de to await further instructions.
If any other technical mishap occurs, they can also contact the above email address.You will be able to see if your referees have uploaded their letters during the time of application at the portal.