Yes, if I export the file and upload it traditionally; it works but it's too slow: the upload started 3h ago and reached just the 29%!!!! On the other hand if I upload it by the in-app exporter in FCPX it goes faster!
I can't wait 24h to upload a foolish movie of 3minutes !
(I tried even to duplicate the project and share but it doesn't work)
However, thanks for help