I'm on LR5.7 and have been using the Flickr publishing service happily for many years. Over the past few weeks, I'm getting the following error "Can't update this collection. Flickr API returned an error message (function upload message Filetype was not recognised)"
This makes it seem like it's on the Flickr side but it sure would be nice to have a fix. Also, maybe this is just a British thing (recognised)!
Are you trying to upload a video or raw file or some other filetype that is not accepted by Flickr?
I don't think so - just following the same workflow I always have
1) Select raw images
2) place them in the album I want in Flickr in the Flickr module
3) Ask it to publish
I think it's usually converting to jpg as it uploads. In this particular case, it's only images, no video files.
Worked for a long time and suddenly, not working.
This is also being discussed in flickr forums (Flickr: Discussing Lightroom has stopped uploading to flickr in Lightroom 3 and above: Flickr Publish Service)