I have been trying to upload a web gallery from Lightroom 2015 to a website I created in Muse hosted by BusinessCatalyst. I have encountered a number of difficulties but have now reached the stage where my Gallery is there in Lightroom. When I fill in the Upload information and click on "Upload" the process seems to work and the progress bar on top left of screen moves after a short period to approx 50% where it then sits. After perhaps 20 mins the following error message appears "An error occurred sending the file : an unknown error occurred".
Any ideas would be gratefully received.
similar errors often occured to me - I solved the problem by exporting the gallery to disk first and then uploading the files to server using some external FTP client like for instance Filezilla