I am one of the community managers of this forum and work at the GIZ.
If anyone has had problems attaching files to their posts, please either reply to this post or send the SuSanA Secretariat an email and let us know, so that we can fix any problems in this regard.
A few users who recently updated their Firefox browser ran into some difficulties whereby they could not attach any files to their posts. We have since fixed this, but are happy to hear about any other difficulties encountered in this regard.
You should be able to upload upto 20000KB (approximately 19Mb) and the following file extensions are supported: